People shouldn't be so quick to judge based on a handful of reviews. Who knows what other headphones the people that have the K267's own. It's very possible that many of you might miss out on something that actually is a good headphone.
As for a quick comparison with the M100, the K267's lack the thickness of the M100's. Mainly in the mid-bass region. The biggest difference between the two is bass. The M100's reach just as deep as the K267's but packs a bigger punch and it leaks into the mid-bass region where the K267's don't. Treble isn't far off from each other but the K267's sound cleaner and airier to me. Midrange is also not far off from each other but the K267's are slightly more forward and is thinner sounding. Females vocals render better with the K267's but the M100's adds more to male vocals. Stage wise, both are really good but the M100's are more of 3D and K267's are wider. For me, both are keepers in the sound department so far.