I have them, 26-9-12s. I have 1000 miles on them and they wear well but I will get bighorn2 next time. The roctane XDs ride rougher and the p500 needs all the help it can get in the suspension department.
I have the 27x9-14 up front and 27x11-14 rear on MSA wheels on my 700-4 and once i cleaned out my spark arrestor can't tell any difference from stock other than they pull a lot better. Buddy of mine had them and said his would bleed air around the bead after sitting a while. No problems with mine yet but they only have about 80 miles on them. They are the same weight as the backwater evolutions in front and lighter than the rears of the same size. Ive heard the rumors of sidewall punctures but have 3 sets in my riding group and no issues yet