Been using Backcountry a while now (motion x as well, tho prefer BC), just tried out the lead nav last trip.
The added voice commands really bumps this setup above the others IMO. Found this easier to use as well, if not familiar with backcountry, there is a bigger learning curve there. I did often get blank map data last trip, as if it were using cell data when no signal was avail, even though I did download the map area prior (this could be a fault on my behalf though). The GPS tracked the line so atleast knew i was on path.
For lead nav and backcountry I have the upgraded maps/version etc. I ran Backcountry on the dash mounted tablet, and leadnav on my phone (dash mounted as well). It worked great, had 2 maps to reference, but since my phone is sync'd for music, the audio from lead nav would come over speakers and override music for turns/hazzards/etc. Iphone 6S GPS worked well with app too, had tablet running gps off my Dual XGPS160 dongle, and it tracked well by itself
Hoping the map download data was just user error, but plan to run both these setups in the future
