This is my third bluetooth headset.  The H700 was great, nearly perfect.  Plantronics' 220 is not bad.  The H710 is nearly identical to the H700, but the outgoing voice quality makes it nearly impossible to use.  It sounds like you are talking through a piece of paper.  My friend also got one and also had the same problem.  We are unable to carry on a conversation using H710's on each end.  Too bad, because the physical engineering is excellent.