Preordered the 4-pack on Steam to work the price down to $40/person and got the Season Pass. I played the **** out of BL1 on Xbox 360. I not only played each build legit from the ground up to LVL69, but also experimented with modding weapons, shields, etc. It just never got old. I was really scared that BL2 would try to do too much and ruin a good thing, but so far so good. My only complaints are the removal of fall damage (c'mon, if a bullet or melee attack can damage you, a 500-ft drop should as well) and the fact that you can't play as the original characters (maybe DLC someday???). Neither of those complaints impact my love of the sequel, however.
The only real problem I have now is finding time to play! I've got a LVL24 Assassin (play by myself), LVL21 Commando (playthrough with wife and friends), and a LVL6 Mecromancer. I still haven't had time to start a Gunzerker or Siren yet. My wife's LVL21 Siren is crazy powerful though. All her attacks have a chance to corrode enemies, so combined with her favorite weapon (Fire Fire Spinnygun), she can really bring the pain. I'm excited to see the endgame!
FYI, you can STILL use a modified BIN file to get 255 Golden Keys (after Mecromancer DLC and Booty DLC). I just did it for my LVL24 Assassin. I, like many others, made the mistake of opening the Golden Chest in Sactuary without even realizing what I was doing, so I wasted my key on a weak LVL8 grenade mod. I spammed that Chest with my one build and I'll be honest, they did a good job making it all purple and magenta items instead of orange+. Many of the items in the Golden Chest are pretty good, but most are disposable. Seems like every other weapon is a "plasma caster" type that burns through SMG ammo like no tomorrow.
If you want to play modded or unmodded, just add my Steam ID: