Just got back from running them (dry conditions only), running a basically bone stock MST CMX. I ran stock foam and 2oz in the front wheels. The terrain ranged from moderately grippy rock to smooth slick rock, dirt and sandstone. At first, I taped up the vent holes and we ran a dry man made creek bed. I thought they did ok, 6-7 out of 10. They definitely didn't lose the slick rocks and struggled with the loose dirt on top of the rock.
Decided to try them vented and was surprised at the loss of performance (5 out of 10). I'm guessing the tight tread pattern was closing up too much when vented. We went back to a few difficult lines I'd run a hundred times before with the same vehicle and struggled on several. Two I couldn't do at all. On the moderately grippy stuff, they worked pretty well but required some wheel spin. With them spinning, they were predictable and didn't produce a ton of wheel hop. Definitely need to adjust your throttle finger with these and know when to gas it and when to let up.
Over all, I'd say they are an OK performer. I wouldn't buy them if I had a choice of other tires but if you get the MST CMX kit and are on a budget, they will do you fine until you can afford a better tire.
