I really like my MTRs they overall have done very well on the runs Ive had them on. Ran them at fall crawl, a few runs and down at Rausch creek. I would guess since August Ive put a bit over a thousand miles on my trail rig and so far the wear is very minimal and they have held up very well with one exception.
On the comp course at Rausch I was able to climb almost anything and they did great in mud and on rock crawls. For almost the entire time Ive used them off road Ive run them at 10psi and get very good grip and flex. Down at Rausch it was suggested I should try them at 8 psi. BIG mistake according to Lou and I do agree with Lou on this one in retrospect. I want to be clear im not blaming anyone for what happened at 8 psi, just passing on what Ive learned... 
Apparently radial tires like this can suffer torsional tears (at least thats what I think Lou called it) and pop a bead easily if run below 10psi. The radial has such a good grip the side wall can split as you apply torque to the tires and they grip but the sidewalls (despite the Kevlar) cant move with the tire and tear as load is applied (yeah i'm starting to talk out my butt here but you get the idea of where i'm going
and I'm doing my best to paraphrase what Lou said...) So ive done great at 10pis but popped beads twice at 8psi. One time was on a hill climb and you know what happened there, later that same day I lost a bead in a mini-rock creek on a separate tire (not the one that folded on the climb) that resulted in 3 side wall tears two of which had 4 or so plugs in each. I asked Lou about bead locks and was told that they are not appropriate for radial tires so it looks like I will be staying at 10psi from now on. I still love the tires and highly recommend them as long as your OK with running at 10psi. Lou is seeing what can be done about the other tire and i will update when I hear back from him on that...
