Better than expected.
OK, first the good: These are super -comfortable and really secure. I bought them because they are really low-profile and work well under a moto helmet. They don't come out of my ears while I'm putting my helmet on or taking it off. Exactly what I needed.
The controls are excellent. Volume, pause/unpause, next track, previous track. Everything you need at your fingertips.
The bad: The bass response isn't great, but for this price, what do you expect (I guess). It's not terrible - you can still hear where the bass is supposed to be, it just won't blow your mind when you throw in some hip-hop or dubstep. The other not-so-great thing is the instructions, or the lack thereof. You're on your own when it comes to figuring out the controls. So I'll help - click the center button once to pause/unpause. Click it twice for next track and three times for previous track. Volume is self-explanatory.
Overall, I'm super-happy with these. I gave them 5 stars because of super-clean sound, and I kinda figured the bass wouldn't be anything amazing at this price.