Here's a decent L90 demo: http://www.youtube.com/watch?v=z-FxMhFbBmk

Even with distortion, you can here the depth, width and clarity in the tone. It really comes through when the video cuts to his face and he bites his lip, and makes those pained expressions. Oh...no I dian't.

Apparently he has a 8H /6H set. Higher H = more mids, and less highs, generally. A 6H in the neck should match output better with the L500XL, but you could probably comp jazz better with a 4H. Becky should know.