As a sales person, I'm on the phone constantly in my car, so I wanted a high quality bluetooth headset that would last for awhile. From word of mouth I heard that the HS850 was a pretty nice bluetooth headset. After buying it I was impressed with the small size, light weight, and flip open mic. It configured easy with my blackberry 7130e phone too. However, after having it for a few days I quickly found out that it severly lacked proper amplification. It was very hard to hear people on the other end and I found myself pushing the headset against my ear just to make it louder. Just to give you an idea, the volume at high was about 1/4 of the volume if I was just listening to my phone without the headset.In the end I returned the headset and got a plantronics 320 which was about half the cost, but with much better volume control. I would recommend this to anyone that is in the car alot and needs a dependable bluetooth headset.