Bronco LB 52 will be able to give you a more informed opinion on the minor leaguers involved, but the deal seems to be one that could help both teams.
La Roche had a monster second half and his presence in the lineup will help Bay a lot.
Gonzalez is a nice pickup for the Bravos, who haven't had a decent closer option since Smoltz returned to the rotation.
I guess a lot of it depends on Saloman Torres. He was great for Pittsburgh down the stretch last year and apparently they view him as a viable short term closer option this year. If he can handle the job, it will work out to be a good deal for the Pirates. If Torres falters, its going to cost those young starters some wins.