Rand McNally Tripmaker RVND 7710 and 7720

We have the 7720, it worked flawlessly on our 11,000 mile trip to Alaska this past summer in our 22' B+. A bit a learning curve, compared to our old, old, 1st generation Garmin Nuvi, that we use in our toad, but we like it. After several months use, we feel it was a very good purchase for us. However in our 40' DP, which has a computer tray, I prefer to navigate with my netbook and Delorme Street Atlas, as I have for the past 9 years.