Course, the McIntosh amp they used drives up the install cost

Personally I'd lean towards the TomTom app if I was serious about using it as fulltime nav.
Was talking a while back with a mate that this would be a perfect use for them. Hyundai have also announced that for their new range topping Eqqus, they are dispensing with dead tree owner manuals and instead supplying an iPad loaded with a Hyundai app instead. (Well, they haven't said iPad specifically, but that's what is pictured in the mockups so far)
As for wifi, well they don't do that because that's what Zune does. They have to be DIFFERENT. That, and you
can update via wifi:

:>