Received the Montana yesterday. Was easy to switch my subscription from the explorer to the montana, took maybe 15 minutes outside.
Here is a picture of the 2 units so you can see their size.
First impression is this will be a great improvement for texting. A real qwerty keyboard touch screen - goodbye tedious hunt and peck scrolling for letters when trying to send messages or input waypoints. hope to take it out on the 4 wheelers this weekend to test tracking.
Years ago I started off with a garmin 12XL, great gps for hunting, then garmin rino 120's, then added an iridium phone (huge but worked well), then a smaller iridium phone - got tired of the fees involved, and tried an iridium go that you pair to a cell phone for texting / e-mails. worked well but a flaw, the unit turns on when charging so needs more time when trying to charge from a small solar panel. Then went to the garmin explorer after they bought DeLorme, gps and satalite texting in one unit.
And now the montana, looks good so far. The unit is bigger but the screen size will help with topo's and maps. also works as a car travel maps gps unit.
When plugged in to charge, the unit starts up, but can be turned off to charge while off.