We have a Garmin and The Camping World Rand McNally RV GPS with 7" screen.We got it because of the bigger screen and you can put in height restrictions etc. For some reason,the Rand McNally sometimes won't let you enter info which is frustrating. Or it tries to guess what you are trying to input and over rides what you are entering.The Garmin is better but it seems my Samsung S4 phone is the best of the bunch. You just tell it where you want to go and it takes you there.Why can't stand alone GPS units be this easy?