We have one and like it. The height and length feature is nice but its imperfect. Is it better than a GPS without it? Yes, definetely. But, when you get into more rural areas it tends to be more of a guideline than a factual route. Its really an issue of mapping data I think. Not enough of it exists to make that functionality perfect.
RV GPS Review- Decent write up about all the RV GPS options. They like the 7720 and the DEZL 760 as the top of the line options.
I think most people vote for one or the other in most of the threads I have seen.
