I first ran these tires on my old FJ Cruiser. I had the 33's and they performed so well that I was hooked.
I have the 35's on my Rubicon and they have performed flawlessly in a variety of situations. Off road in mud / rocks / dirt when aired down to about 18 psi they are magic. There is some rubber chunking in the lugs from sharp rocks etc. but nothing out of the ordinary. They grip on wet rocks better than KM2's of the same size. I was doing a lot less sliding on these. Although they have a "D" rating, the sidewall is still flexible when aired down.
More recently I had them in the snow / ice and didn't know what to expect. I had read favorable reviews in such conditions but it wasn't until I actually got in the white stuff that I found out just how capable a tire these really are. No slipping. Performed admirably and felt confident. They have a similar tread / lug pattern to the General Grabber but with a better compound from what I've been told. Plus they have some siping which is a huge plus in the snow.
I suppose my only gripe would be that they largest they manufacture is a size 35. It would be nice to perhaps move up to a 37 in these but no dice according to Big-O. Oh well... Also it would be nice if they had a bit more aggressive sidewall lugs but I haven't had any problems off road thus far.
Highly recommend and I will be running these for some time to come.