I use the Good Sam Rand McNalley with the 7 inch screen. It's only me and the cat so using a smart phone, tablet, or laptop isn't an option. I like the way I can program in the height and length of the motor home so it will avoid sending me on roads with low overhead clearance or tight turns. I've velcroed the mount on the dash so I can reach it. The seven inch screen and large readouts are easy to see. The speed reduction warnings come in handy. The speedometer in the motor home is difficult to see in some lighting conditions so I use the speed indication on the GPS screen. All in all I am very happy with it and think it was worth every penny.