I myself, am not too keen on Google Maps+Navi. Gotta constantly download maps...
No thanks - I have a GPS already, maps on it's SD card, good for me.
I'd like this to hold my PHONE, thanks, for easy HUD for dialing over the car's bluetooth, mebbe answering texts at stop signs/lights with the Speech-To-Text, etc..
If I need navi, well, I'll use my NAVI unit...
If I need to call, well, I'll use my PHONE