I believe becuase of the boom it tends to "flap" around more so then the likes of say H500 hands free, but that only seems awkward when you have fast head movement, otherwise not a problem. Will not fall off, barely notice it is there, very comfortable, unlike the H605 I tried. The volume is not a problem, loud enough and callers can hear my whispers, I did crank the volume to full. Loud enough but I feel that the H605 I tried was louder, but that is a direct in ear ear piece, but that thing was very uncomforatable so this is a excelent balance of everything, plus a neat boom to flip open and answer, I can slip this on the ear very easy. I like.