The player is available in either a flash or hard drive-based model. The flash version is exceptionally thin, especially considering all the receivers and transmitters going on inside: FM tuner and transmitter, Wi-Fi, Bluetooth, and GPS--how did they fit all those?!
The GPS offers a real 3D map option. You can only download one city at a time because each one takes up about 2GB. Basically, it gives you a bird's-eye view of the city along with directions. And there's an adventure mode with a compass, for just wandering around a new city.