I've heard alot of people rave about them. I just put a new set of the older tread style BFG M/T on my 89 SWB and I LOVE them off road. I don't use it as a daily driver though so the winter driving isn't as important to me. If you check out tirerack.com, each tire has a tire rating based on user reviews as far as how long they last, performance in snow, mud, ice etc. From what I remember they got real good reviews.

I needed a set of tires for my 08 Tundra pickup and considered these too but I do too much highway driving to justify a Mud Terrain tire even though I REALLY like the looks of them. I researched and bought a set of the Dunlop Maxx Trac instead. They are very reasonably priced, 10 ply & aggressive but will be good in snow and highway. If you are interested, here's a link:

http://forum.ih8mud.com/80-series-tech/279711-dunlop-rover-mt-maxx-trac.html