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I have the M100 and I am incredibly tempted to take part in the upgrade offer and get some. All the reviews I have read seem to say that they sound nearly as good as my M100's even in wireless mode and sound a little better in wired mode.

Unfortunately I don't have any firsthand experience with sound or the wireless quality, but I am also very interested to see if anyone here has them.
 
I've got the original Crossfade Wireless in black, with the larger pads and matte black plates. I like the headphones - they sound good in wireless and slightly better wired - they've got great range, and with the larger pads they're quite comfortable. They're a bit bass-heavy, which I like, but the bass is clean and pretty tight. All-in-all, great cans!
 
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