It totally depends on your head
I find the 810 is great. If oyu want one that really "hangs on", try the Logitech bluetooth headset (not the Mobile one, their first bt headset). It clips to your ear from behind. I use that in the house and can move all over, lay down, etc and it doesn't move. I found the Jabra 250 fell off my ear at the slightest head turn.
The volume is OK (very subjective of course). I understand the bt volume isn't great, especially if you are on OS 4.0. But my "ok" might be your "too low".