I love the dog. I bought it in 2018 and it has never let me down. If you are looking for something just to pull you and your buddies plus kit out onto the ice it's the way to go. I buried it in 10 - 12 inches of slush last year and disconnected the toboggans and drove it right out of the slush with no difficulty (it's like a little tank).
Very little maintenance required, change the oil just like your snowblower/lawnmower. Grease the bogie wheels and chain and your good to go.
Gas mileage will depend on how hard you drive it. Max speed is 30 km but that's pretty quick for sitting on a toboggan behind it and on a hard packed trail. I can get about 4 hours on a tank while bird hunting in 1 foot of snow (going relatively slow) or 1.5 hours if I push it through deep snow with my gear behind me.
I also like the fact that I can drive it into the bed of my truck turn it around and drive it back off. (now they sell them with reverse).
Storage is way easier then a sled, just put it on a trolley and push it to the back of the garage for the summer.
I definitely would recommend a snowdog for ice fishing.
