I recently installed the Blaupunkt Toronto head unit. I also installed the $20 mic in hopes I would be able to use it for hands free calling.
The head unit looks OEM'ish and it was super cheap. I had it professionally installed.
However, the bluetooth phone functionality is very poor. In fact, even sitting in the car with the car not running (power and accessory is on) people can't hear me very well. Does anyone have the same problem? You can see where I mounted the mic... right next to the cruise control sticker.