I bought the H800 to replace an H700 I had lost.  The sound quality was very good but the comfort and ergonomics were a big step back. I tried the H800 (thinking it would be better) and I didn't care for it because it was uncomfortable. First of all the H800 is a lot bigger than the H700 which you can't tell from the pictures. The H800 hangs on the ear but has a little nub that goes in the ear which I found annoying. The function button on the H700/H710 is well placed over the center of the ear so when you press it the headset doesn't move. On the H800 the button is shifted toward the back and when I tried to press the button, the headset kept moving it kept falling off and was hard to press.