We've had them for ~7000 miles now. Great in the snow, OK on ice, OK in the mud and seem to be good offroad (I've haven't done anything too extreme in them though). We also took a 2500 mile trip in them over Christmas - cruised awesome at 90mph, very quiet for the tread pattern, no tramlining, just a nice smooth ride. They also seem to have excellent treadwear - I haven't noticed any wear so far.
BTW - our Land Rover dealer puts them on all their CPO cars, so they must be pretty darn good.
One more quick addition - if I had been paying for them, I would have considered putting on the BFG ATs to get the extra ground clearance (they only come in a slightly larger size). But since we didn't pay for them (they came on the car when we bought it), I couldn't be happier
-Rich