Glad everyone else is happy with their Montana's. I have an OLD Montana 600. Could be the battery dying or just the unit giving up. It's in the cradle in my truck constantly...and in direct SoCal sunlight. More and more the unit will not charge. I've had issues with routing crapping out at 80% calculated a lot recently and it seems like I have a conflict issue with the original maps and the lifetime map updates I've downloaded. To get around routing stopping at 80% I have to disable the latest map updates.
As a last resort on the routing calculation errors, I'd like to wipe out and reset to factory defaults everything, but that doesn't clear all the map updates.
Garmin has gone two ways - either on or offroad and not one that will do both effectively. The 'closest' one I've found is their DriveTrack. It's actually made for dog trackers and has both on road and 100K offroad topos preloaded. Like all of Garmin's on road products, they won't endorse the use of 24K topos. At least with the DriveTrack, Garmin's site does list the 24K topo maps as being compatible.
It's at least an option and the best crossover on and offroad out of the box GPS unit I've found so far.