i bought this one because of the excellent review, however, after pairing it to my Treo 650 and using it for a couple of days, i'm quite disappointed.  The sound quality is ok, sound level is on the low side and some noises from time to time.  i had a Samsung WEP200 too and had better quality than this one, and Samsung WEP200 is about half of the price of this.  then there is the usability issue too, sometimes i hear the phone ringing, and pushed the button to accept the call and it wouldn't connect right away, had to wait several seconds to establish the link, the Samsung WEP200 and another Motorola ear piece i had did not have this problem.