Purchased at Costco, needed a headset fast with the new CA driving laws. It was easy to set up with my phone (SE W810i), which is a year and a half old. Sound quality seems fine, and I haven't gotten complaints about hearing me from the other end. It came with a car charger, however you can't use it while it's plugged in, so you have to remember to charge it before you need it, when you aren't driving.
It is really small, which I don't like because I know I'll lose it someday. It isn't big enough to put any idenitifcation on it.