After reading the previous excellent reviews, I decided to order the Plantronics 510. I am using a Motorola V710, and needed the hands-free capability in my car.The unit was received quickly, and I was impressed by the size and weight of the headset. I charged the unit long enough to allow the headset to "handshake" with my phone. They became good friends very quickly, and within a short period of time, I was communicating. My first call was to a good firend who is very critical about audio quality, and he could not tell that I was using a Blue Tooth headset. I was able to walk around the room, and into the next room without static or interference.The unit is light, easy to learn and use, and is built very well. Yeah, the operation buttons are a bit small, but they are easy to get used to, and the power button has a very distiguishable point on it that lets you know where it's at.I give it 5 ***** Worth the $50 bucks!