Jeff,
Trip reports from club members here in DC- about 100 members or so. Running places like Paragon, Gore, Tellico, even GWNF. Sidewall blowouts or cuts seem to be a frequent occurance with the BFGs . The reports just reinforced my personal experience that the sidewalls are very flexible (good for some things) and rolled over onto the rocks making them vulnerable to damage. I havent heard anything about the new KO/KM models to change that view. The big plus for the BFGs is that they replace them with no questions usually. The members of the club generally consider them a street tire, and good trail tires are TSLs (bias and radial) , Boggers, and SX's and lately good reports about the MTR from Goodyear- none of which have a replacement policy, but none of them seem to need it.
I had a few of the older AT and MT that had sidewall problems- I cut at least 5 on three sets of tires( not all new)- so I gave up on them . I was on a ride once when someone had 2 cut sidewalls - same vehicle. Im not saying they are all around bad tires- and at one point I was even thinking of trying the new 33-10.50KMs, but the sidewalls are a known weak area- no matter how many plys they have on them. For a street/mild trail tire they are fine no doubt(although I did loose a sidewall to a storm drain on one of my work trucks) and the flexible sidewall gives them a decent ride , but anyone taking them on the trail should recognize the sidewall problems, and drive accordingly. It seems that here on the east coast we have more branches, and sharp rocks on the trails that like those BFG sidewalls.