I got a green class mod from the new ones for my character, promptly followed by a purple one for every other character. And I play solo.
Oddly, I could equip the Krieg class mod on my Commando. It appeared to work - affecting my clip size IIRC, but obviously didn't give me any stat boosts.
I got two of the Lightning spells from some rather intense wizards towards the end of my session (I'm guessing like 80-90% of the way through the DLC - pretty sure I just have a boss fight left), and although I wish I had laid my hands on one sooner, it was extremely gratifying blasting dwarves and skeletons. I'm thinking of doing a respec for the sake of more grenade-focused skills.
Oh, and Moxxi's Crit was really frustrating. I came across it laying there, uninteractable, so I tracked down the quest, trekked all the way back, and then, well, then the quest played out. *Shakes fist at Gearbox* AND after all that, it flies out of my hands almost every reload. I get the joke - but I wanted to use the gun to shoot things, not just to make everybody giggle. lol