Just got my new Rand McNally TND 720 yesterday and went to download the Dock software and connect to computer to register the unit and updates...
It's 16 months old = no warranty BUT for $400 should it be broken and worn out already? I don't think so, as my Garmin 660 had been and still is...
Bottom line ......... just buy Garmin as their hardware is much much better and your new gps won't be sitting broken & useless like my RM is mere...
I am contemplating this exact purchase right now as I am in need of another "truckers GPS" and though I have not used either the Garmin Dezl 760...