i played kels and 4% on a small tv near the back left of the room (if you picture the room just as you walk through the door), juggleguy on another in that corner, and i played vanz and raynex on the row of tvs just to the left as you walk in.
also i don't really mind the puff ditto...in small doses. sauc3 tells me it feels basically the same as metaknight dittos.
and uh, basically i agree with foxlisk. if you can rest oos and kill someone, you should, by default. you should refrain from doing that when it doesn't make sense in terms of the stocks or the percentages...y'know, when it'll put you at a disadvantage.
uhh...i guess upsmash oos could be good against fast fallers at times when you're not sure rest oos would work. i'm imagining it like this...fox is nairing at you and misspaces it a bit so his foot is kind of on top of your shield, and you're facing away from him. maybe you could get a rest off, but you could just as easily miss. if you upsmash, maybe you can rest him out of that, or get some sort of combo or techchase going, but it's not very risky if you miss. and it's good at trading with things, to your advantage. in other words, the higher "accuracy" rest has the more you should be willing to use it.
upsmash oos also seems really situational, since fastfallers can crouch cancel it for a while, and it doesn't force them to tech at very low percents either. at 10% you might kill falco with rest oos but you probably won't get to combo him with upsmash. i don't know what percentages exactly 'cause i never really use upsmash except to kill peach or jiggs.