The Borderlands 2 4-pack is a great deal. So the 10% preorder and 10% Borderlands bonuses apply, but do all 4 players get the preorder bonus Premiere Club/Golden Key?
I've heard good things about SR2 as well. The PC port is regarded as one of the worst in porting history but I've read that if you have a beefy PC and install a certain mod it becomes playable and even enjoyable. Note that it's $3.74 for the next hour if you want to take the risk...