It's a great unit though it does eat batteries. Mine is used only for auto navigation and it has excelled in its performance.
Just a couple of notes: (1) depending on your vehicle and its windshield/dash configuration, you may find that the remote antenna may provide improved signal reeption and (2) sometime the "redraw" of the screen is rather slow.
Garmin's magnetic mount external antenna really does the trick. I mounted mine on the back edge of the hood in the center. Also, it might be my imagination but it seems like the speed of the "redraw" can be improved by keeping the amount of map data to a minimum.
BP