[MENTION=136384]unterhausen[/MENTION] My understanding is similar to [MENTION=468325]lightbulbjim[/MENTION] in that the routing is done on the phone but it can be done offline (no Phone Data if you prepare your maps while having access to WiFi). These new units let you download and store locally on your phone sections of maps, maybe a whole county, maybe a state, maybe more. Personally I don't find that a real deal breaker.

Still I am going to wait on some real reviews, not unboxings or talking heads regurgitating PR releases.