I'm loving Roy so far. It's everything I wanted and more, Roy is my new main. I KNEW my thousands of hours that went into Marth wouldn't be for nothing.
As you all know, Roy kills like a beast. He's got a ton of kill options now, more than Marth could ever dream of having.
Fthrow true combos into DED from 0% to around 25 ish. It can also be used for tech chases and such, as you all know.
I wish Bthrow had more knockback so you could space with it better offstage, there's not much you can do with it it seems.
Upthrow is pretty much identical to Marth/Lucina's, so the uses are the same.
Dthrow is a godsend, it true combos into many different things at different percents. It true combos into Fair at about 90% on most characters, which is amazing. There are so many options for dthrow, so mixing up your followups is a breeze. As long as you keep mixing it up, you can usually get a second hit out of Dthrow.
Neutral B is great offstage because it has so little ending lag. I've gotten tons of kill by jumping off while charging.
His recovery is pretty decent, IMO. The pros of it greatly outweigh its cons. As I've seen mentioned many times, it's great OoS. It can even be a surprise kill move if you play your cards right.
In a match, I found Roy even has a chaingrab-esque string. At 0%, Fthrow to Fair to regrab to Fthrow to regrab to dthrow seems reliable.
I could go on about things for much longer, but I want to go play more Roy!
It's funny. In melee, Marth was the superior character by far. My, how the tides have turned.