As a caller using this, it works great. Good volume, stays comfortably secure in my ear, the battery lasts quite a while...really no complaints. It's pretty straight-forward and easy to set up with my RAZR V3i. Bluetooth sucks the life out of the phone, though...but that's a different review.As the person usually on the other end of my calls, my wife likes this and thinks I sound great with it...as long as there is no background noise or wind. Apparently, this little guy's mic is very sensitive. I was eating lunch at a local pizza joint and she could hear what was happening in the kitchen...stuff I wasn't even noticing and I was the one there...lol.So, it's a bit sensitive, but works well for me and makes driving a stick-shift while on the phone a little safer for everyone.