I've owned a GMG for years (guessing at least 5-6), before they had cute frontiersman names. No WIFI, no stainless chimney cap or green wheels. My hopper is smaller than the new units, shorter than the new units, and actually has a warming tray built in below the grill. (Never found a good use for it, though I did defrost some frozen hot dogs once in it!)
That being said, it is truly a set and forget once you know your temps inside the grill. Mine is hotter on the Rt. side. Like what was mentioned, running out of pellets is really the only issue other than undercooking or overcooking.
Smoking is really not a pellet grills strong suit. Yes, it can give off smoke and it adds a light, smoky flavor to everything. To turn it into a true smoker you will need to add a different source of smoke (generator, tray, etc.).
Yesterday I grilled up some pork chops and it was 10 degrees out. Once you know your grill, you don't need to stand out in the middle of winter babysitting hot spots, flame ups, etc.
It's one heck of a machine. My suggestion is pick a few brands you are interested in and contact the sales reps. Mine was a demo unit for the rep. He came over with a couple grills (this old model and a newer one with a IT probe! still no WiFi available), baked a cake, grilled some brats and burgers. That night he had an order for a new unit and the old unit never got loaded back onto his trailer. I kept it and have been grilling at least once a week for many years with no problems.
I live in a town of <300 and I can name at least 25 GMG's in use right now. Great rep service and a great product speaks for itself.
Hope this helps!