I use a Garmin Dezl. Got to learn Basecamp (Garmin's free route planning sodtware) in order to get custom routes. I have come to like the system a lot. Though I do run my Android phone and google maps right beside the Garmin.
Do you mean the 560 Dezl? I've used a RV/Trucking Garmin before, and didn't like it at all. It refused to route you through streets/roads that were labeled "No Truck Traffic". Made following a plotted route a real pain.