Balfour isn't a fair comparison. He blew out his shoulder and took 2-3 years to make it back to the majors. Be happy that he overcame the injury and made it back but hard to fault the Twins too much for that one. (edit: actually he got hurt following the '04 season and didn't pitch in the majors until '08. It is a pretty amazing comeback story). Breslow was unfortunate, dropped him for a nothing guy, but it's not like he is a dominant reliever, but he is a worthwhile piece. That is why it is amazing to see any level of angst from anyone on this move. Best case he is a 4th reliever and like was said earlier that never hurts anyone, it is the most fungible piece in all of baseball.