These are a very good dynamic IEM, and when I say dynamic, I'm not just referring to the type of driver. The sound is very forward, very exciting at first, and I was immediately struck with the immense sound-stage. The drivers are very responsive and demonstrate better speed than I expected. If you love any form of electronica, buy them. I was hard pressed to find fault with any specific aspect of the sound while I was listening and the bass is incredible. However, I was quickly fatigued by listening to them and afterwards my head felt full of grit...

These were just the second set of IEMs I bought, the first being Etymotic's 4S about 10 years ago. This was my first purchase intended for portable use (with a Clip +). At first, I was blown away by the low end, not in comparison to a real headphone set up, but to my 4S plugged into a laptop watching Netflix. Hey, I'm just being real. My Etys were, at first, a curiosity, nice for the occasional foray into 80s new wave, then essential to avoid pissing off the wife while I watched deeply disturbing Korean films. So I'm not use to hearing bass and was...

I love these for watching movies at odd hours or on the laptop away from home. They're so comfortable that I can wear them for 6-8 hours straight. Unfortunately, I find them totally unacceptable for music, though they're a better fit for portable use or the computer because of EQ. Several posts compared the sound quality to etymotic's 4 IEM, uh, no way in hell. Proper fit is crucial to both comfort and sound quality -- read the included instructions. Additionally, make sure you dig in the case pouch pockets for the foam socks - without them the bass...

 Purchased as a demo. I find this amp to be an excellent mate for Denon D7000.