I have one and now wonder how I ever found my way without one. When I started booking my trailer into Sportshows I decided I had better have one because I didnt want to get lost downtown in some big city while pulling a $100K trailer around. After doing extensive research into the units (checked out consumer reports and read reviews from several other websites as well) I decided on a "Intellinav One" sysyem made by Netropa Corp. Does every thing the top end Garmins will do but for half the price. Has online updates when you think its needed, voice prompts, 2d and 3d screen, several route and travel options, mp3 and photo albums (which I never use). Has all US and Canada cities and points of interest. Its never been wrong yet and I've sure put it to the test. You get what you pay for with these things so don't be afraid to pay for a top end system and avoid the bargins.