As most have been so far, Gizmodo's review was favorable of the M-100's. I will simply choose to pretend I didn't read this part.
"You wouldn't want to use these headphones to mix a recording. The mids aren't perfectly articulated the way the highs and lows are. The headphones capture all of the details of recordings, but they don't sound as clear or flat as standard bearers like the Sennhesier HD 250s. Yup, the M-100s' sound has color to it. That's going to bother a lot of people, but we loved the tonal blend."