I got these with my Sony Ericsson Xperia Ray phone, and I'm pretty disappointed with them.
Basically, the problem I have is that every time you so much as touch the cable, it communicates a really loud, noticeable bass thump into the headphones. If you run your finger along the cable, or it brushes against your clothes, you get a rubbing sound. Basically, unless you like loud, deep thumping sounds in your ears ALL the time, you have to sit completely still while you listen to music with these.
The only alternative is to put them quite loosely in your ears, and then they don't sit very securely. It seems that the problem is the design of the cable, and in making it tangle resistant, they've gone and done this instead.
It's a damn shame that they have this flaw, as the sound quality is excellent, and they seem really well built.