I've had these tires for a week, in that week, we've ridden slippy roots in Crested Butte, loose sand and dirt two days later, slick rock, and the hard pack single track of Salt Lake City. These tires held up against it all. I would definitely recommend them!
However, I also agree with Dave Beyers comment, they were really tight on my rims, and took a serious battle for me to get them on. Let's just hope I don't end up on a ride with multiple flats, that could get a little frustrating!