Got a really good deal on a pair of M100's from someone on here. After spending a week with them I have to say that I wish they had 'fuller' bass. Even after EQing a fair bit and using the bass boost on an e12 I can't help but feel unsatisfied. Maybe I should have just got the SZ's instead (probably will next) but I was hoping to achieve a more well rounded sound sig!
As an aside, If you want something without lyrics that has copious amounts of deep bass I highly recommend checking out stuff put out on the Chord Marauders label.
Here's a couple of favorites:
Congi - Leaps & Bounds
Congi - Somnium