Juve has a knack of getting the very best out of players - if we do get Cassano, I think we will see a more mature, and a much better player than he has been at Roma.
I think we just have to trust Moggi and Capello on this one.
There were a few people who questioned Zlatan when he came...and look at the impact he had. Of course much of that is down to Zlatan himself, but you shouldn't underestimate the effect that the professional, stable environment that Juve offers, can have on players.
I just think the Juve Cassano will be very different from the Roma Cassano.