I recently completed an 1800 mile round trip to pick up my new 5th wheel. I had my Ford F350 in-dash GPS going as well as my Rand 7720. Some might think that's a bit of overkill but there are advantages to this idea. For instance, I could set the Ford unit on 'long range' and dial up the on-line radar weather to see what was in front of me. At the same time, I also had the 7720 set up with my destination.
Yes, I know smart phones are handy for this, but I travel by myself and can't just sit there playing with my phone while driving.
This was the first time I really used the 7720 and I must say I was impressed. It worked great. You do have to get used to all the info it shows around the screen perimeter, but after that learning curve is completed my combo GPSs worked great. The 7720 has a lot of features that I like. Two in particular are that it shows the speed limit of the road you are traveling on as well as your actual speed right next to it. The other, and my new favorite, is that it shows the highway mile-marker you have most recently passed. And it changes to the new marker number almost exactly as you roll past it. It also has a huge campground database - I like how I can set up a route to just about any campground in the country just by pushing a few buttons. I have always had Garmins in my cars but I REALLY like this 7720.