The voice recognition worked really well, it totally surprised me that it would be that good in a moving car.

Can the lower models play music on an SD or MicroSD card? Also can they transmit the music / directions over FM?
Other features the higher end models might have:

*Lane assist
*Car, Bike, Walking directions
*CityXplorer maps (public transit routing)
*Larger Screens (this is NICE)
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Chad