Break them in, break them in some more, then break them in one more time and they work.
Yes, Larry runs them (37" Rocker) on the KOH truck and hasn't ran them enough to get them fully broken in.
We are running the 35" Rockers on both stock mod rigs with great results. They do get clogged fairly easy in thick mud and clean out okay, on rocks and higher traction surface they really excel. They are not super sticky like a red label krawler or other comp. compounds, but they are dot tires. Like all tires they work better in certain conditions, in Perris, Ca both our rigs made some climbs easier than other tires (similar rig comparisons) and have some great sidewall traction.
Biggest gripe I have is they are wide (new sizes are always coming out) and they take some time to break in, definetly not a mount it and go with great results tire.