I don't want to frighten you, but the first one I got was cheap, via EBay. It sounded awful and I sent it to a guy called Solderdude who tried to modify it for me. Turned out to have fake drivers inside, so I sent pictures and the name of the company to Audio Technica.
The company reimbursed my money immediately without me even having to return the fakes.
Beware if they are too cheap...
I wrote about them on my own site. I found the picture that Solderdude took of a driver, which turned out to be different from AT pictures. We were all fooled until they were opened up. I'm Rabbit ........
http://diyah.boards.net/thread/791/ath-msr7?page=5