I love them so far. They have great traction on the rocks, and I like them on desert trails.
At Moab, they gripped the rocks better than most other tires in our group. Where others would spin, the terrabites gripped and crawled right up the rocks.
Not sure how they perform in mud, haven't tried yet, and I'm not a big mud fan. And not sure on wear, not too many miles on them yet. Probably 300 to 400 miles so far.
But based on the performance so far, I would definitely buy them again.