I have the Rand McNally RVND 5510.
I use it every day . . . matter of fact, I use it as a speedometer instead of the one in my car or truck!
I bought another power cord and windshield mount so I don't have to move everything when I need to switch it between vehicles.
However, I also bought two of those round dash pad mount thingys and the anti glare visor . . . don't waste your money on these things!
The visor doesn't really block any light from the screen, and since most dashboards aren't perfectly flat, the round dash pads don't stay stuck down to the dash, plus the suction cup on the window mounts won't stay stuck to them since they are slightly curved when mounted on the curved dashboard.
Anyway, I have POI's for Walmart, Target, Camping World, RV dealerships and repair facilities, Discount and Big O Tire shops, Costco, Wendy's, McDonald's, Burger King, Cracker Barrel, Red Lobster, Subway, Carl's Jr, King Sooper's, Safeway, Rite Aid, Walgreen's, RV parks, private, state and national campgrounds . . . and much more!
And it has many built-in POI's already for just about every kind of retailer you'd ever want to find (of course, the liquor stores are the most important of them all
)!
It has steared me wrong a couple of times . . . like when I wound up in the parking lot of Cabbella's national headquarters in Sydney, Nebraska instead of the entrance ramp to the highway, or the wrong side of Eleven Mile Lake from the campground (although I was in the State Park, however).
I've never owned another GPS before, however I did use a Tom Tom last year in Florida and that one at least told you what lane you should be in to make the turn ahead, where the Rand McNally doesn't do this (unless I just haven't figured out how to make it tell me that info).
I don't know if the other brands are better than the Rand McNally GPS units . . . but I'm sure glad I have it over not having one!