I had the Garmin 800, never really used it that much. The Garmin 830 is so much better for me. It allows me to put an address in and then it works pretty much like a car gps. It wants you to turn around if you missed a turn until a shorter route is calculated. I'm mostly looking to get to a destination and being properly rerouted if I go off the calculated course. I have not tried GPX files to see what happens when I go off course. When touring often I make side trips for restaurants, bike shops or points of interest . I normally wouldn't need to retrace my route to get back to where I left GPX route.
Pros: GPS/GLONASS, searchable addresses and poi's, touch screen
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