I've used these as my main IEMs for about a year, and I can agree with a lot of what's been said here. Great, warm bass and articulate mids (especially percussion) on a lot of my rock and hip-hop. Highs were a little drowned out on some tracks, though. For my pair, I felt that a long burn-in significantly improved sound quality; out of the box, the bass wasn't nearly as powerful and a lot of guitar-heavy tracks weren't very clear. They started sounding even better hooked up to my Fiio E12. Great durability, too. After a year of heavy use, the only noticeable damage is a tiny rip in the plastic connecting the wire to the jack, but it doesn't cause any connectivity issues. Very much worth the $40!