I was replacing a Plantronics headset that didn't work well and was hard to use, and the HF820 works much better for me. Earbuds/headsets always seem to be uncomfortable for me (or even hurt). I think most are designed to fit men. I also like the fact that there's no problem using the HF820 while wearing sunglasses.One feature that wasn't mentioned in the product description or in any of the reviews is that the HF820 does have a mute button. That was a particular feature that I wanted but was not sure about when I ordered it.An AC adaptor sure would have been a nice addition. I don't often drive for 2 hours at a time to charge the device initially. But overall I'm very pleased.