Bought this to replace the HS820 simply for the flip-on functionality. After about 2 months of use, I have concluded that with the exception of the flip-on trick, the HS820 is actually a better headset. Mainly due to the volume. The HS820 has MUCH more volume and even seemed to fit on the ear a little better. Not a bad unit at all, but the volume and fitment issues should have been resolved before product release.