Nope, don't work for them, I was just chosen to test tires for them as I have a reputation for trashing shit...they figured if they could hold up to the bashing I give em, then they ought to do well. Also, we are full time into rock crawling, not just hobbyists, so we have more of an opportunity to travel and test the rubber in different regions/conditions and give them our point of view, instead of kiss-ass corporate testing's point of view.
Yes, I have chunked my share of ProComps in years past, but that is equal in comparison with the amount of THIN sidewalls I've blown on BFG's and GoodYear's...they really are tradeoffs. ProComp has worked to develope the new XTC rubber compound to fix the chunking issue and reworked their sidewalls to make them even stronger. These newest tires will be out soon and then is when I say that ProComp tires will become one of the best crawling tires available.
As for how they work in competition...we have never popped a tire and only had 1 chunking issue where we heated the tires to the max burning em for about 7 minutes at 3800 RPM with the back end disengaged and stationary (Bob Roggy took part in this one)...when we let it go and caught a big rock, we broke off a couple lugs...this also had happened on the MTR's and the BFG's in the same type of testing, so it really doesn't show a strength or weakness. Believe me, we've so far tested em all...Swampers/MT's (claws)/BFG's (3 types), and MTRs...all the same size and all in the same conditions.
As for soft stuff, in a comparison with the different tires ON THE SAME RIG, with similar pressures (around 7 is what we run in the CJ), in sand and soft dirt climbs, the X-terrains went an amazing distance farther. They float well yet hook up.
Craig Stumph of UROC even called and commented on how surprised he was about how we were "crawling" the soft stuff at ProRock in Fernley, when the others were trying all RPM's and having little luck. We made soft climb-outs that killed the others...it was the tires.
Finally, I will support all brands equally if someone asks...we are in the sport to promote the sport, not just our partners. This thread asked about X-terrains...I gave the opinion of someone who has more time on those tires than anyone.
If someone had asked about BFG...I would given mediocher reviews of the A/T and M/T, and good reviews of the Krawler...
So to those inferring I am biased as ProComp is a partner...I tell you I promote RedBull and Yes, I drink 3 to 4 cans per day...I ALSO DRINK COKE and LOVE BARQ's RootBeer!