Iuse the SWD all the time when i fight as long as i remember to 
, and also if im not in a squeeze at the time, know what im sayin' 
I can/do/ and have used it when i was behind, but i dont advise it that much
As far as tips with the SWD, well for the most part honestly what i did was first see that i could do it the way i had read about it: (you probly already know this, but i'll explain it just incase )
Swd1 - drop a bomb, as soon as your in bomb mode hold a direction, left or right, now as soon as the ball hits the ground, tap your control stick in the other direction. I say "tap" because some ppl believe that you have to have the utmost speed to do it which you dont then you'll see others slamming their control sticks sounding like they're almost breaking the poor things, that is also not needed. It CAN work but those actions arent required(but they do help I'll explain later )
Note - THe SWD seems hard to do at an almost consistant basis. Funny thing is....half of us can be really good at it and not even know it because:
Theres 2 points in the swd where the swd can be "cancelled"
1- and probly performed half the time sadly, is right when the samus WOULD start taking off, but doesnt because after you "tap" the other direction its important to try and leave your controll stick in a good position cause just about ANY other directional input can cancel out the swd at its birth point so to speak. Although these cant always be seen where a samus messed up , this note is a factor in whether or not a samus will swd at any given time, for obvious reasons such as i can do up to so far 10 in a row left to right, then going back right to left, however in a actual battle my hands are a little more tensed possibly, so concentrating on the fight AND the swd isnt always the easiest thing to do, but it matters i guess how used 2the swd you are and how important the match is
2 - The second instant where the Swd can be cancelled at is basicly any time after the swd is executed. "cutting it short"
I got tired of swding right by my oppenant when they're in the middle of the board only to have to run back to fight them, or worry about an attack from behind. So i found my way to "cut it short"
"Cutting it short" - is just when i swd, and notice how far i've gone, OR time it (since im used to it ) and cancel the swd with a wave dash going in the opposite direction. and at this point i cut it short so that if my opponent is in the middle of the board, i go by them, only to wd back towards them and by this point i can do any attack, cause i'll be just that close to them, and half the time if they expect me to be at the other end of the board they feel they have a second or so....and thats when Link goes to pull out a bomb and eats a F-smash 
(just as an example) In my opinion, a very useful tech at times.
SWD2- i call it "The stand still" swd - because well...you do just that. IMO this is a more advanced aka harder way to perform the elegant swd
to do it just drop a bomb as b4 but instead of holding a direction, you dont press anything really for the most part, and if you do its just to help yourself time the first direction. But you just wait to time everything. I started doing this the first day i trained with the swd because using the first method for about an hour was killing my thumb lol so i thought theres gotta be another way to do it, and sure enuff i asked maybe you dont have to have all that direction holding and then slamming the control stick = pain for my thumb. I'm sure others were using this way already b4 me, its just thats the way I stumbled across it.
OK as i mentioned earlier...about how the slamming of the control stick and how it actually helps in a way.
What it does over time is basicly "personalizes" your contolstick for you, and kinda just you. Your thumb personally wears down the stick in a way only you can from extreme use, or in some samus' way swd training. After i realised this I asked DA WES seeing as tho he was another samus known for swding and hesaid the same thing, everyone wears down a controller if they play with the same one over time but its not always the same. Like if we buy a new controller i can swd on it, sure. But attempting anything like over like SWDx4 is gonna take a while. then i'll go and pick up my"SWD contoller"( I actually call it that folks) the contoller that came with my cube and that i swd trained with and bust out like 6 in a row, and be like " Oh........ok....*turns off cube cause he sees he still has the touch*"
Theres many a things you can do with the swd, like have the homing grapple out already swd and while your zooming use the grapple so that by the time you stop its already coming out and you can possibly grab your oppenent and what not lol
Or you can do a full length swd to a spamming fighter on the other end of the board and possibly add a down smash for a little range infront and behind you at the end of your swd journey across the board.
These are ideas i've done b4,they work, but best if used in a surprsise manner.
To conclude...some ppl say try to SWD in training mode at such and such speed. usually at 2/3 speed, whereas otheres like me wear Nikes and "Just do it"
That slower speed traning helps ppl out i guess, but the way i started i just did it and just kept at it either way the swd is a move that ya like hugs may say " inst needed" but it doesnt hurt much to know it and know how to use it, and the ins and outs of it.
, and also if im not in a squeeze at the time, know what im sayin' I can/do/ and have used it when i was behind, but i dont advise it that much As far as tips with the SWD, well for the most part honestly what i did was first see that i could do it the way i had read about it: (you probly already know this, but i'll explain it just incase
)Swd1 - drop a bomb, as soon as your in bomb mode hold a direction, left or right, now as soon as the ball hits the ground, tap your control stick in the other direction. I say "tap" because some ppl believe that you have to have the utmost speed to do it which you dont
then you'll see others slamming their control sticks sounding like they're almost breaking the poor things, that is also not needed. It CAN work but those actions arent required(but they do help I'll explain later ) Note - THe SWD seems hard to do at an almost consistant basis. Funny thing is....half of us can be really good at it and not even know it because:
Theres 2 points in the swd where the swd can be "cancelled"
1- and probly performed half the time sadly, is right when the samus WOULD start taking off, but doesnt because after you "tap" the other direction its important to try and leave your controll stick in a good position cause just about ANY other directional input can cancel out the swd at its birth point so to speak. Although these cant always be seen where a samus messed up , this note is a factor in whether or not a samus will swd at any given time, for obvious reasons such as i can do up to so far 10 in a row left to right, then going back right to left, however in a actual battle my hands are a little more tensed possibly, so concentrating on the fight AND the swd isnt always the easiest thing to do, but it matters i guess how used 2the swd you are and how important the match is
2 - The second instant where the Swd can be cancelled at is basicly any time after the swd is executed. "cutting it short"
I got tired of swding right by my oppenant when they're in the middle of the board only to have to run back to fight them, or worry about an attack from behind. So i found my way to "cut it short"
"Cutting it short" - is just when i swd, and notice how far i've gone, OR time it (since im used to it
) and cancel the swd with a wave dash going in the opposite direction. and at this point i cut it short so that if my opponent is in the middle of the board, i go by them, only to wd back towards them and by this point i can do any attack, cause i'll be just that close to them, and half the time if they expect me to be at the other end of the board they feel they have a second or so....and thats when Link goes to pull out a bomb and eats a F-smash (just as an example) In my opinion, a very useful tech at times.SWD2- i call it "The stand still" swd - because well...you do just that. IMO this is a more advanced aka harder way to perform the elegant swd
to do it just drop a bomb as b4 but instead of holding a direction, you dont press anything really for the most part, and if you do its just to help yourself time the first direction. But you just wait to time everything. I started doing this the first day i trained with the swd
because using the first method for about an hour was killing my thumb lol so i thought theres gotta be another way to do it, and sure enuff i asked maybe you dont have to have all that direction holding and then slamming the control stick = pain for my thumb. I'm sure others were using this way already b4 me, its just thats the way I stumbled across it.OK as i mentioned earlier...about how the slamming of the control stick and how it actually helps in a way.
What it does over time is basicly "personalizes" your contolstick for you, and kinda just you. Your thumb personally wears down the stick in a way only you can from extreme use, or in some samus' way swd training. After i realised this I asked DA WES seeing as tho he was another samus known for swding and hesaid the same thing, everyone wears down a controller if they play with the same one over time but its not always the same. Like if we buy a new controller i can swd on it, sure. But attempting anything like over like SWDx4 is gonna take a while. then i'll go and pick up my"SWD contoller"( I actually call it that folks) the contoller that came with my cube and that i swd trained with and bust out like 6 in a row, and be like " Oh........ok....*turns off cube cause he sees he still has the touch*"
Theres many a things you can do with the swd, like have the homing grapple out already swd and while your zooming use the grapple so that by the time you stop its already coming out and you can possibly grab your oppenent and what not lol
Or you can do a full length swd to a spamming fighter on the other end of the board and possibly add a down smash for a little range infront and behind you at the end of your swd journey across the board.
These are ideas i've done b4,they work, but best if used in a surprsise manner.
To conclude...some ppl say try to SWD in training mode at such and such speed. usually at 2/3 speed, whereas otheres like me wear Nikes and "Just do it"
That slower speed traning helps ppl out i guess, but the way i started i just did it and just kept at it either way the swd is a move that ya like hugs may say " inst needed" but it doesnt hurt much to know it and know how to use it, and the ins and outs of it.
but it's easier then everyone say.
(swd)-> ---------------------(bomb)-------------------------(you end up here) 
