I've had my unit for about a week now with the intention of leaving it in my car all the time. It performs well enough in my limited usage, but perhaps the biggest drawback is that it automatically turns itself off after 5 minutes when your phone is out of bluetooth range. The power connector (USB to cigarette lighter) is only for charging the internal battery. So, this means that every time you get in the car, you have to turn the unit on by pressing the power button for 2 seconds. What an oversight. Why not just make the unit wake when power is applied? Anyway, this is a deal breaker for me. My unit is going back.