See, I think there's just so much uptalk in the M-100 thread, that critical reviews get overshadowed. I've given the M-100's a fair shakedown back in October, and I honestly wasn't all that impressed with them. Personally, I think the M-80's offer an incredible value by comparison. I found the bass impact of the M-100's borderline overbearing; pad mods are required to hollow out this feature. I spent a long month A/B'ing the two. While most of my friends preferred the modded M-100's to the M-80's, the majority felt they weren't worth the premium(that's to say the M-80's are an incredible bargain through Amazon Warehouse).
For my style of music, I found the M-80's sounded better across the board (although the M-100's sound crazy good with some EDM, rap and most grooves found in today's pop terrestrial radio stations)
The M-80 has very good bass reach. The rumble is very audible, but the cans don't shake to the level the M-100's can. As far as sonic capability, The M-80 vs M-100 debacle is more of a preference in flavor, then a question of either's superiority to one-another
Edit: I should mention, the M-80's are very seal/position sensitive. It can be a challenge for the sound to line up
So you means that M-80 are very "standard" headphone, with overall good SQ, and M-100 have more "contemporary" in their sound signature? :D
As for the Amazon Warehouse deal, do you think that I should buy the M-80 used from it? I can buy pretty much anything used, but my mind often hold me back when it comes to used headphone lol :D for some reason I really don't want to buy used headphone, unless it's a manufacturer refurbished like what Sennheiser do :D but this time what got me is the price. Man, the $120 white is really a bargain! :D