Can someone tell me how you get free earphones to review? I'd love to review earphones but I don't really have a lot to spend.

I know its quite some time since you asked this question, but my apologies I only saw this thread today... I own both the 500 and the 600 and i must say the bass on the 500 is really smooth and dynamic, a little punchy but not as strong as the higher end ones like ue700 or triple fi 10.  The...