He had a great year this year on a disappointing Kentucky team. I only saw one or two games of his this year but I would say Schaddy is pretty much spot on. Hes got an NBA ready body, he's big, strong, pretty athletic for his size. Hes got good touch around the rim, decent at defense and shotblocking. He seems like a pretty low energy/emotion player, I'm not sure if its because he doesn't care or if he just doesn't get too high or too low emotionally like a Tim Duncan. He also lacks aggressiveness and killer instinct. I'd compare him to Erick Dampier; big, strong, decent athleticism for his size, decent touch around the rim and a decent post game when given touches, lacks focus (especially when he doesn't get the ball on offense).
Hes still very young but I think he'll stick in the NBA. The big question with him is whether he'll just be a backup or a starter and that will probably come down to how aggressive and focused he is because he has the physical tools and skills to be very successful in the NBA. Good low risk high reward signing by Isaiah.