I received my HS850 and I love it. The only problem was that it enters pairing mode differently than my wife's HS820, so I actually had to read the manual (shudder)

I haven't had to recharge it yet and was able to talk to my wife on my entire commute into work (We have a new baby, so we are always on the phone with each other)

I was able to go into a 7/11 and get a coffee and snack while my 7100t was still in the car without any issues in clarity.

I also like how it will give me a low key beep if I drive in an area that has no signal. This was great since I didn't have to look at the phone to see if I could call her back yet. I just waited for the beeps to stop.

I also paired the HS850 with my wife's Nokia 6600 to check it out. It paired flawlessly and worked great.

All in all very happy with it. i got it off Ebay for $88.98 shipped.