I bought these because the ratings implied a solid quality sound, and I have been extremely satisfied with the Mackie mixer I bought years ago and used these headphones with. Unfortunately I don't think I could have picked headphones with worse sound than this. I've tried the MC-250 with two different mixers and a lot of different music ranging from classical to electronic to noise music and my own compositions, and the common thread is that through these, anything sounds cheap and powerless. It's not that the MC-250 lacks bass or treble. It's more like it lacks everything, and the end result is a plastic, lifeless sound with all joy and power sucked out of it. Even when cranked up to ear piercing volume levels, the sound is brittle and without any punch whatsoever. Buyer beware.
In addition it took only a year for the right side headphone to die on me, so build quality may not be the best.
My greatest regret is that I only got to test these properly well after the two weeks return period. Otherwise I would have most certainly returned them. They aren't very expensive, but every euro put into them is wasted for sure.