FWIW, I notice BT's first listing has ATH-M50 listed
I traded my M50's for M40's, and have bought a couple more M40's since. Not due to any problems, just needed more headphones for the studio.
Everybody's opinion will be different of course, but I technically lost money on that that trade and still feel like I came out ahead.
M50's have exaggerated bass in my opinion, which was messing with my mixing efforts when played on other systems.. if you have an opportunity, do compare before buying.


Make your sound your own!
.. I do not work here, but the benefits are still awesome