I bought my Goodyear MT/R w/Kevlar 285/70/17 about 6 months ago and have put almost 6000 miles on them and here is my review of this tire at this point.
I have lost 1/32 of an inch of tread which is surprising. I expected more then that by now. I can find no cuts or chips out of the tread. And there is no cuts in the side walls. I have aired down only once but the tires aired down well with good flex and no cracks occurred during the off road run with them aired down So here is my review for each surface
Snow- A.......Don't get a lot here but this year we had several 4 to 8" and in 4hi it went right through it. Wish I could had deeper test though
Ice- ?..........Had a little under the snow and had no slippage but not enough to judge
Wet road- B..Does real well on wet road but one hard rain I did slip a little on sharp curve but only once
Dry paved road-A.. For a mud tire this thing is pretty quiet and smooth on the road. It is a nice ride
Rocks- A++..Took it on a rocky river bed and some steep rocky trails, excellant traction
Mud- A........It handles the mud with no problem in 4hi and 4L. Would give A+ but 2hi there is some slippage on real muddy inclines but put it in 4wd and it takes right off
Dirt- A++...Dirt trails and dirt steep hill are a piece of cake and this tire eats it up
Gravel- C....It eats right through it but it also grabs the gravel and several trips over the same road leaves track marks and makes the road bouncy
Air down on trails A++.. Excellent traction on the climbs I have done. Limited run with it aired down but it held up great
Overall I give it an A and highly recommend the tire
The only downfall I can see with the tire is the weight. Gas mileage takes a pretty good hit. but if you do multiple types of off roading from dirt to rock then this tire is one of the best I ever owned.
I really like this tire