I have had this for over a year. I use it with a Motorola V3 Razr. I only learnt a few button beep based functions. After so much wear for over a year and a half, the button may not get depressed correctly and gets double "clicked". That might be my techinque. Voice quality is very good. There no wind protection. In windy situations the caller on the other side does complain. Bluetooth range is supposed to be 30 feet. I have used it at about 50 feet or even more. from the garage, past the driveway, across the street next to the mailbox. Made a call, sharp clear sound, call went ok, then I reached for my phone and realized that it was still in the cup holder of my car parked in the garage. For functionality, it is good. Do learn all those beep codes. I only know one or two. There about thirteen functions in all I think. Also, I dropped it somewhere and it cracked near the power plugin area. yesterday it fell again and the crack was gaping open. I twisted and pressed the unit until the the crack approximated. It still works fine. One other thing. if you block its path with some objects between this unit and your phone you will hear crackling sounds. There are also some secret functions in it too. weird.