My full size backhoe has a cab and dealing with it is a pain. Because of that and wanting to go into the woods to pull logs I made the choice not to get a cab. Sure there are a few times that it would be nice in the middle of the winter I wouldn't mind a cab but it's not that often and there are as many, if not more that I'm glad I don't have one.
While using the BH I'm always getting on and off the tractor. That means always opening the door. It always seams like I'm working on enough of an angle where the door closes on it's own. The cab AC is pointless when using the BH because with the rear window closed you loose too much visibility. Sure if you want to keep the windows clean it would be much better but when you're working in the dirt they quickly get a layer of dust. A cab without AC needs to have every window open in the summer, even in Vermont. I've already broken a turn signal and a work light on the cab trying to work in the woods.
If my sole use was to blow snow in the winter and the cold really bothered me, if I used my tractor to work a field or some other way where I wouldn't be getting on and off all the time, or if I had a medical condition it would be different, I would have a cab.