Had the ability to fish out of one for a few years. They are amazing! It was similar to a boat in regards to mobility etc We kept everything in it, trailered to a lake, backed out of the trailer and off we went. Could easily cover a lake in a day moving around. Was not uncommon to move 20 times in a day with it. They have their place, not for everyone, but if you want simplicity and not dealing with any elements of weather when setting up, moving etc they work amazing. We literally fished in a hooded sweathshirt and jeans every time. Never had to put bibs etc on. We carried emergency gear with but never had to utilize it.
Did some overnights in negative 40 below and had zero issues. but i will say that they are not the most comfortable for that. It works but they are really designed to be utilized like a boat, keep all your gear inside it, hook up and go. Moving from spot to spot is extremely easy, push a button, raise the tracks, drive to your gps spot, lower, drill a couple holes and fish.
Never got it stuck, they typically operate off one track but have posi in case you need it. We went through alot of snow, crossed alot of heaves and fished in places that unless you were on a track machine of some sort you were not fishing that area.
Look for a good used one, can usually get a 5 to 6 year old machine for around 45 grand. They really do not change from year to year a whole lot and they do hold their value. The one I was fortunate to use sold in 2 days for 3 grand more than what was originally paid on it.
Speed wise they run about 20 miles an hour across the lake.
If your main objective is to stay mobile, be out of the elements and not hunker down for a long period of time, they are the ticket.