It's a fairly new design, but I don't know for sure how new. I think it's about a year or so. To me, it's a pretty good compromise: It's got a little more tread than the MFG MTs and a little less than the ATs. Unlike the ATs, however, it has good sidewall tread going down several inches. Traction was great on wet rocks, dry rocks, mud, loose dirt, etc..
I had them aired down too much. See:
I used someone else's fancy valve deflator thingies, but one of my tires ended up at 14-15 psi. The rest were 17-18 psi. Because the traction was so good, I'll probably go with about 22 psi next time. They do have heavy sidewalls and weigh 84 lbs a piece. At 40 psi, they drive great on the pavement.