Yup, the Montana's are pretty deluxe. Congratulations on the acquisition. Did you figure all out the nav features yet? If so there is future for you on the lecture circuit.
The only thing the the other model has is the camera, and a pretty good one too, and a fuller navigation function suite when used like a NUVI, complete with traffic updating, hence the "T" in the destination. I suppose it also has more internal memory or processor speed to handle topo and hillshade apps, I'd have to look. Mine came with the same base map as yours. To get the enhanced map with the tax lots I had to buy the SD card too. You can also get nautical charts and river atlases in the same format. It's rumored that both have a standard brew coffee function, and spouse proximity warning feature, but so far I have not accessed either.
Bottom line it's a whole lot of GPS with a whole lot of functions, enjoy!
