Wasn't sure what to expect with this, but it works flawlessly and it is very easy to use, as well as very portable.  Probably my only complaints are that you do have to read the manual very carefully to understand the various colors and blinks of the lights, but once you know your way around it - the device just works.  Callers cannot tell you are on a bluetooth and you can hear the callers very clearly.  It has exceeded my expectations.  Plan to get another one for our second car now.