Nice impressions. Don't have my M-100 to compare right now. The bass on these doesn't seem as big, or have as large of a mid-bass focus, as the M-100, that's from memory though. These are definitely one of the more natural headphones I've put on my head. Comfort is top notch for sure, I really love how soft the headband feels :p
Anyways, pictures are always fun. These headphones are fingerprint magnets, otherwise, the design is really simple and intriguing. I like the design a lot.