I'll give you the bad first. First off they aren't a snowmobile. Top speed on packed snow trail is about 30mph on my 700 polaris. Top in powder is about 15. All total on quad weighs about 1,000lbs with boxes and crap, then add your weight. In deep snow with a thin crust it is all you can do to turn one unless you have power steering. They will suck the gas tank dry really fast when pushing through snow, so you need extra gas on board if you plan on covering some ground = more weight. Take a spare belt if your machine runs belts.
The good. The Polaris brand are made for any terrain. Sand, dirt, gravel, mud, snow....anything. They will go anywhere. Top speed is about 20% less of top tire speed...so they haul arss and don't suck nearly the gas as on snow. They cross rivers that aren't too deep and climb like a tank. They make your machine more stable and you have more clearance. If you like to hunt spring critters and fall, where trucks and quads can't get, then they are perfect. The only thing that will stop it in snow is when you start pushing snow. When you get it burried you better have a good winch 'cause it is like getting a small car stuck...
My buddy has a pair that are "snow only"...do NOT get those.
I consider mine 20% snowmobile, 60% quad, 20% tank.
Personally I love mine, but it's going to depend on how you want to use them. If you want to chat about them p.m. me and I'll give you my number.
That is my son.
HK