He really impressed me against Kentucky. There really was no stopping him. They ran everything at him, trying to slow him down, but he blitzed past every single defender on the court.
I do think the size will be a bit of an issue at the NBA level. I don't think it will prevent him from playing his style of ball, but I don't think he will be able to pinball his way to anywhere on the court at will. Currently he's not going against trees (Pau, Drew, etc) or the physical specimens like Ron, Landry, Dwight, Bass, Maggs.
His 3 ball seems to be better than Rose's, but unless he has a really good vert. he might have some trouble getting his shot up over the bigger opponents who tower over him (even though he shoots a bit of a rainbow).
Certainly appreciate his leadership skills and heart, I think those two attributes will take him a long way.