Sorry for being late to the party
When I went from 33x10.5's to 35x12.5's on my YJ, Cepek had just released the Extreme Country so I took a look at them. When my tire guy quoted me a price I had to give them a try. I'm not a mud guy but the varied terrain we play in requires a stout tire. First thing we noticed is that they are a bit taller than and a full inch wider than a set of KM2's that also came in that day. My initial concern is the 2-ply sidewall vs the BFG and STT Pro's 3-ply so we'll see if it becomes a problem. I've only got about 1k miles on them but I'm running them unbalanced and they have to be one of the roundest tires I've run. So far they've handled the hardpack snow and slush better than my BFG KM2's did. I'll post updates when we actually get to hit the hills and do some exploring.
Fresh off the truck:
Mounted on some Ultra 15x10's, ready to bolt up:
On my YJ, 4" suspension lift, 1" body lift, TJ flares: