I too have seen the same issues with 2 different Motorola headsets (H710 and H720). At first I thought the H710 had gone south, based upon numerous comments from people I was talking to on the device (muffled sound, cutting out), so I grudgingly upgraded to the H720. The problem was actually worse with the H720! Replaced the H720 - same problems. Given that Apple has apparently said NOTHING, I turned in the H720 back to Best Buy and bought a top of the line Jawbone Icon. Same issues as described in other posts here! Connect/disconnect at 1 meter range, really short range in general, muffled sounding voice reports from whomever I talk to. My wife's iPhone 3 has none of these issues with the same equipment. So, so far I've essentailly penalized Motorola and Best Buy for what is blatantly obviously, at this juncture, an iPhone 4 issue. APPLE, HELLO!!... Anybody there??... Given our loyalty (iMac, Macbook Pro, Macbook, Mac Mini, iPad, 3 iPhones), believe me when I tell you that I expect a publicized explanation, apology, and, oh yeah, a comprehensive fix.