DEZL is about as nice as you will find in my opinion (not worth much). Some people will argue that the Rand Mcnally 7720 is better but it all depends on what you like. I would say the DEZL is a more serious device than the Rand. Plus I think the dezl has a much easier user interface.
Few Write ups on the DEZL vs Rand
http://www.irv2.com/forums/f53/garmin-dezl-760-a-few-features-159881.htmlhttp://www.doityourselfrv.com/rv-gps-comparison-review-best-options/And of course the
Posts here on rv.net.