Thanks for the info, Practice Auto.
One last question if I may. What's the voice quality like? You hearing them is generally never a problem, but them hearing you over the background noise in the car is often an issue with most non-fixed handsfree devices. Have you had any complaints, or equally any positive comments, from the other end of the line about how well you can be heard?
I need a decent all in one solution since I used to have a car with both a built in phone in the stereo and built in sat-nav but now have a 'better' car... with neither. 