My brother seems to recommend these things to just about everyone, so how do the zune premium earphones compare to, say, the etymotic er6i's?

I'm looking at the CX 500's Amazon.com: Used and New: Sennheiser CX 500-B In-Ear Headphone Those cheap ones on the bottom look good, but a little too cheap... In the speedy-shipment store's reviews one guy said that his CX's were fake, and the seller wasn't accepting returns on it, but...