I would only recommend a Garmin and I would only recommend Mapsource Topo. This is the only product that I know of that they provide free updates to the software and free updates to the unit firmware. Mapsource also interacts with Google Earth,,,, SWEET ! I have been pounding my Legend for 3+ Years on the handlebar of an ATV.
Visit
www.PaulsWackyWorld.com to see GPS guided ATV adventures.