I have about 10,000 miles on my KO2's and have been very happy with them. The first couple thousand miles they were pretty bad about grabbing little rocks and throwing them into my wheel wells but that issue went away once they broke in a bit. What I really like about them is they are good looking all terrains yet not ultra soft, so the tread isn't rubbing away to nothing in rapid fashion like most all terrains. So far they have the best tread wear of any AT tire I've owned. Guess I will see if that continues but after 10k they show almost no wear at all, still look like brand new tires. I tow a loaded up cargo trailer daily for work and lots of city driving, stops and corners and crappy roads we have here in Phoenix, plus unpaved rocky roads and construction sites and they look like fresh new tires, staying nice and crisp. They feel a little hard/give a slightly more rugged ride but I like that in a truck tire. I don't like feeling like I am driving on marshmallows. They give my truck a very tight/responsive feel compared to what was on it before. I did see fuel efficiency decrease by about .3 miles per gallon which is basically nothing and they are larger than what the truck came with so this could be a discrepancy in the computers read on it or efficiency could be more affected for that matter I don't know, it doesn't seem noticeable to me because I go thru a couple tanks of gas a week no matter what anyway. They are the best tires I have owned after 20 years of driving and buying tires. Highly recommended. Wish they made them in more sizes and with E load rating, I want to put them on my E250 as well.
Horrible in wet or snowy conditions and have been since they were initially installed on my truck. The slightest wet pavement (spring/summer months) and my rear wheels spin when accelerating from a stop sign causing the traction control to kick in. I would not purchase these again.