Got the H500, not complaining about design, packaging, etc - everything great.First and most important - nobody can hear me. That's enough to trash this thing. If you're still looking for more:1. headset turns itself off at its own will, hard to know when it will pick up the call or not (maybe this is a problem with all no-boom headsets?)2. volume is average - can hear good indoors, lousy in the (standard) car and outdoors.