I want to upgrade the stereo. I get that there are some out there that will integrate to the steering wheel, but, what do you lose? I see the steering wheel integration as simply being volume, tracks, answer / hang up phone, etc, but, if you replace the stock stereo (I have the SatNav system), how for example, do you change the time on the dash? Should you expect to be able to get the distance to turn to turn up on the dash still? etc, etc.