My thoughts & feelings on Mobius...
===CONNECTIONS===
USB - No extra background noise above disconnected headphones.
AUX - No extra background noise above disconnected headphones.
AUX+USB - Annoying background buzz. Unuseable.
*Background noise is very low, but noticeable.
*I recommend USB, as Mobius did not handle louder volume well at all with AUX for some reason.
*Only USB 3 worked on my Windows 7 PC, not USB 2.
===SOUND===
A very nicely balanced, full sound. Solid and detailed, without much fatigue. Low-reaching bass, but not much impact. Good clarity, but not exceptional. They are decently spacious sounding in stereo mode. Isolation is good, not great.
===COMFORT===
They are somewhat weighty, with a definite clamp force. I find them moderately uncomfortable. I find the headband uncomfortable. Wearing them beyond ~10 minutes is increasingly annoying.
===3D===
The headtracking was something I didn't want or need, but absolutely worked well in my testing; very neat! I did not bother customizing the head shape or other settings beyond head position centering, and felt the 3D in 2 channel games was a nice experience; there is definitely a directional 'smoothing' effect that makes things much less fatiguing than in a raw stereo environment(with non-angled headphone drivers). The 3D did not seem to provide any additional positional audio advantage, though. I did not notice much difference with the EQ presets(which are only available with 3D). I am confident I can identify audio directions better, in most or all cases, in plain stereo mode, though depth of sound may be improved with 3D.
===CONCLUSION===
For my gaming uses(FPS), these won't be keepers for me, mainly due to discomfort. Using all of the buttons to change settings was easier than I was expecting, but all of those features didn't do anything for me. The sound signature is excellent for music or movies(which I feel is their strength/ideal use), or perhaps more casual games, but certainly not for serious gaming. So far, I'd say I haven't heard anything better than plain stereo in headphones for gaming.