I have an HS820 and an HS850 (not released in the US yet). The HS850 is a dramatic improvement over the 810 and 820. My advice, if you can wait until next month, get the HS850. As for this deal on the HS820, this is pretty darn good. I have the HS820 and it works real well. No complaints on this one at all. My wife uses it on her drive home from work and to work and she has zero problems with it.
Good price for a good headset. 🙂