I like the concept, though I have some questions about its execution.

I wonder how difficult the battery would be to replace and whether it can be done by the consumer, or not. If it costs a hundred dollars, plus shipping, to have a replacement battery installed then it might not be worth the expense to me.

Colored maps aren't such a large concern of mine, but the type of map files it uses can be important.

And I, too, wonder about its radio capabilities.