Bought KZ's "best" AS10s a year ago based on all the rave reviews online and especially Amazon. Having heard proper IEMs, these are nowhere near in the league. When people add that callous little phrase in their reviews, "amazing for its price!", I have learned to take that seriously. It may be 'amazing' for 50 bucks, but I'm surprised this is billed as an IEM. The sound is metallic even when used with of high-end foam or rubber or silicon ear tips, and the bass is severely lacking even in the "bass boost" version of these. I guess I'll stick to paying a bit more and getting proper sound.