So after seeing Rob (Skylab) and Dave (Beagle) both comment on these headphones...I picked up a pair. My story is a convoluted one with regards to finding a pair of portable headphones.
My Bose QC15s were very comfy and isolated very, very well, but the SQ left me wanting...well, more. In came a pair of beyerdynamic DT1350s. Great portable cans that were torture devices for someone who wears glasses. Isolation as adequate and sound quality was very good (though closed in)....sold them off after a few months.
So I picked up a pair of UE9000s. The comfort was a major step back, I found the headband way too under-padded and painful after a few hours. I also found them a bit too dark and with the carrying case way too big and cumbersome for travel. So out they went.
Next up with the Sennheiser Momentums, these I really liked, very nice clean sound (though a bit on the dark side of things), but after a few hours the small earpads became an issue and like the DT1350s became painful with glasses over time. As well, the carrying case for them was HUGE and not very practical for travel...out they went.
In came the Sony MDR-1Rs. Very comfortable headphones. On par in that regard with the QC15s. Noise isolation was adequate, but not ideal for flights, I'd have to crank up the sound to hear the music. As well, the carrying bag isn't the safest protection for them as you're travelling. Then the infamous "click" on the earcup. A known issue with a poor design by Sony. So back to the Sony Store they go.
So today I picked up a pair of the M4U 2s, and so far I'm impressed. They're not small and light, but still comfortable on the head. They are reminiscent of the UE9000s, BUT this time, the padding on the headband is very well done and after some time with them, I don't have the same discomfort. Sound quality is similar to the UE9000s, though less dark with some more upper mids and treble (and still not bright in anyway).
Noise cancelling is actually very impressive. It isn't up to par with the QC15s (but nothing is), but it smokes the UE9000's poor excuse for a noise cancellation circuit. Imaging is very good and on par with the MDR-1Rs, that is also to say, pretty darn good.
More to come...