I received the K267's today. They've been burned for 5 hours so take this with a grain of salt.
First off, the build isn't so bad. It sort of looks clunky and not very streamlined. For me, the headphones actually look smaller in real life than in pictures. Headband is too big. Besides that, I trust these as much as I trust the wingplates the M100's have, which isn't much. But, the M100's have held up just fine so far. The K267's feel much better than the plasticky K167's without a doubt. This headphone clamps harder than the 167's did and is about par with the M100's. The pads are squishy and with the clamping force, it might get uncomfortable. Seems a very minute part of my ears are touching the pads so not completely circumaural. The M100's are the same way but sit on your ears more. The M100's can get uncomfortable for me after an hour or so of use because of this.
As for the sound, these are sounding better than the 167's already. I felt the 167's highs sounded artificial after my initial love for them. Ultimately, the 167's lacked something in the upper midrange and I sent them back. The K267's fill that void so far. The vocals are thicker by a small margin and the treble isn't so artificial. The treble seems to be toned down a notch from the 167's tuning in return sounds better to my ears. The bass hits those lovely low notes as the 167's did and sounds clean and tight. The two Tiesto's I've heard now seems to get the bass right. As for the bass tuning, the sliders are very easy to turn. The amount of bass, at the highest setting, I wouldn't call these basshead cans. At the lowest setting, there really isn't a whole lot of bass but still present. In the middle setting, you can hear a little bump and at the highest setting, it adds another little bump. The bass sliders are nothing like the Beyer. COP's which add loads of bass at the highest setting and is unlistenable. With the K267's, I prefer it on the highest setting because it still gives me good clean bass and good quantity. I think the bass at the highest setting is very similar to how the 167's sounded. This is a very good sounding headphone and rivals the M100's for me. I am going to burn them in over the weekend and compare it with the M100's.