The FRS radio that's built into the thing should come in handy later on as well. I already have a standalone radio of that type, so it'll be good if I go with a friend and we somehow get separated. There's also the whole "contact between cars" thing, which would seem a lot better with the radios having a range of a couple miles.
According to Amazon.com, it should be arriving around the end of next week (free shipping for a couple days of waiting... not a bad trade).
I'll probably still keep my old GPS unit around for car navigation, since I've already got a car bracket and antenna for it. Placing the old one in the Explorer where I can view it easily while keeping a (relatively) unobstructed view of the road is easier with that one than the new one.