Bought the M50XBT for my son a month or so ago when they went on sale. Today is the first chance I have had to try them as he is always using them...
Dang, they sure do sound good! They sound as good wireless as wired or close enough I dont care. Very very nice! Considering their insane battery life, rock solid build, reasonable comfort, and a price tag almost the same as the wired model (lower at the sale price I got) these are a no brainer headphone.
He even gets some compliments from some of the kids at school because his school uses the M50X for their Electronic Music classes so some of the kids know how good this headphone is.