i'm 5'10" and have a 55. leg fit is great, as far as upper body fit goes, I swapped the 110mm stem for a 90mm and its great.

Well, I have minimal standover and the top tube feels too long, however the seat height is fine even with over a fist of seatpost out. So I don't know, I just don't like the feel of it. I've gone from a 110 stem to a 100 to a 90 now and it still doesn't feel right whereas my old 52mm road frame felt fine from the get go. I've got about a 31.5" inseam. I guess I just like riding a smaller frame and the Pista feels particularly big.