This is probably the second worst purchase Juve have made in my recollection. Vieira is surely a fine player and will bring needed strength to our midfield, but for only a few years. Furthermore, there were many more appealing, cheaper, and younger options around. Not only that, but we've got midfielders in abundance, there seems to be little reason for buying Vieira.
That said, I'm sure he'll do well for us, and make the team and its supporters proud. As long as we barely win the league and get dumped out of the CL, I'm sure that Moggi and Cappello will be happy.