Johnny Darko's latest review is a good one of a good headphone- of a headphone that is one of my favourites. The MH40 is lush, comfy, and full of innovative tech. John says sums up with the following:
“Right out of the gate, this New York headphone company shows how righteous headphone dynamics are possible from a sealed design, even with an iPod touch as source. That Master & Dynamic manage all of this AND have their headphones look so handsome is one heck of an achievement - the MH40 prove beyond reasonable doubt that substance and style don’t have to be mutually exclusive.”
Source: Master & Dynamic MH40 headphones review
And by all means, read my thoughts on the MH40, both at OHM and at headfonia, and if you have the time, read Master & Dynamic's vision for the headphones.