With my Motorola Razr cell phone that I purchased last year, I also purchased a Motorola H500 Bluetooth Headset for hands-free use. Initially, I was very pleased with the H500, but soon discovered a number of problems that eventually eroded my initial opinion about it.
First, a poor & uncomfortable fit. The inflexible hook that is supposed to keep the H500 secure to the ear was clearly not designed with people who wear eyeglasses in mind. Consequently, it is a constant battle to maintain a snug fit of the H500 against the ear, which involves trying to keep the eyeglass frame on the outside of the H500 ear hook while still both contained by the ear lobe. Otherwise, the H500 can dangle loosely allowing the forward-part of the H500 to bend away from the ear by half an inch or more. Also, I have discovered that after about 30 minutes to an hour of wearing it, the H500 becomes uncomfortable even if I'm not wearing my eyeglasses at the time.
Second, high noise susceptibility. I quickly discovered that when walking outside and there is a light breeze, the person to whom I am speaking gets to hear a loud hiss, making it difficult for him/her to hear what I'm saying. The problem worsens if you are facing the breeze. Cupping the ear can help a little, or walking in a direction that is perpendicular to the wind direction, which is not necessarily possible.
Third, frequent loss of connection with the Razr. When I use the H500, it is normally not more than 3 feet from the Razr as I keep the Razr in a pants pocket. Three feet is certainly well within the H500's Bluetooth signal range, but even so, it routinely looses its connection with the Razr. When this happens, I can still hear the person who is talking to me, but the person that I'm talking to cannot hear me at all. What's really annoying is that when this happens, there is no warning signal of any kind given by the H500. You only find out when the person you are talking to starts saying, "Hello, are you there?" To let the person on the other end know that I'm still there, I have to quickly grab the Razr, open it and hold it to my ear while I do what I have found to be the only way to restore the connection between it and the H500: shut off the H500, then turn it back on and wait for it to reconnect to the Razr. This is really "fun" when it happens while driving, but happens elsewhere too.
Fourth, bad button design. One of the challenges of using the H500 is having a good place to keep it when not in use. You dare not keep it in a front pants pocket because even if you have turned it off, it can be very easily turned back on, especially if there is anything else in the pocket with it. Why is this a problem? Sure it needlessly consumes battery power, but more seriously, when it gets accidentally turned on, the same thing that accidentally turned it back on can cause it to make the cell phone call back the last person that you called without your knowledge. Oh, you'll probably find out later when the person that was accidentally called back by the H500 asks you why you called and didn't say anything. Only if you are wearing cargo pants, where you can keep the H500 in a large & loose pocket on the side of the leg (with nothing else in the pocket), can you be assured that the H500 will not be accidentally turned on and unintentionally call back someone. This problem is not limited to clothing pockets: it can happen if you put the H500 in a briefcase, backpack or any other place where something can press up against it.
Hence, my overall rating for the Motorola H500 Bluetooth Headset is 2 out of 5 stars. I have replaced the troublesome H500 with a Jabra HT 150, whose far more flexible design makes it much more comfortable to wear, does not interfere with eyeglasses and so far, does not suffer from the same inability to maintain a connection with the phone during a call.