There's a lot to like about these headphones:
* Light
* Inexpensive
* excellent fit
* excellent accessory package included
* nice case

What didn't work for me:
I can't comment on the overall sound quality as i tried them solely with my metro...Read morenome for my amature drumming hobby..... However I could tell immediately that I could hear a wider range of frequencies out of the box than the SoundMagic EA10C in ear headphones I bought from this site a few months back. By that i mean you could hear more of the overall sound of the click, which was great as the EA10's are muddy in comparison.
I had to send the M6 PRO's back however as they were actually quieter than the EA10C's (by about 15% i would estimate), which given my metronome doesn't pump out much volume anyway was no good for me.
So, in summary, very nice and they seem to do what they say they do. Just a bit quieter than i needed.