Personally experience that has not been posted yet. I have the older Garmin 7200 in the MH that is now outdated. I am waiting for the new Garmin RV 760 to be released in the next couple of weeks and I will purchase one and here is the biggest reason.
My neighbor bought the Rand McNally 7720, however any additional POI's that we tried to load takes about 10 minutes before a single POI from the POI Factory will load on the 7720. That killed the 7720 for me as I have 22,000 custom POI's on an SD card for my Garmin's that I do not want to give up.
Owning an outdated GPS, I have been able to keep it up to date with the custom POI's I use and the 7720 will not allow me to do that as easily as a Garmin. JMO.