I've had several sets of the AT3s and have had good service from them, probably 7-8 sets overall. I had 1 set get real noisey on me that was on my Durango, got what I thought was a good deal on some pirelli's and those did alright but the mileage wasn't there (longevity they claimed when I bought them) and the Durango was more wishy washy than with the coopers.
So I went back to the coopers. I have had 2 sets of the newest rendition "AT3, 4s" on 2 different Dakota's a 2wd and a 4wd and I don't think they're as good as the regular AT3s.
I bought a pair of Discoverer ATs (not AT3s) earlier this year and put them on the back of a 2wd 1012 ram 1500 at Walmart and after 12k miles so far so good.
I've heard about the horrible stories about "DON'T BUY TIRES FROM WALMART" this is the 1st time. I bought them cash and carry and mounted them myself at work. They'd ordered a set specific for someone and they never returned, they'd sold 1 to someone else, and discounted the rest $50/tire from what they go for over at walmart.com. I think they still have that 1 lone ranger left on the shelf, I will probably go see if they can get me 1 more like it (or if they have it at another location near here)
To replace the other pair of tires that were on it when I got the truck. Those were damneer brand new when I got the truck so I decided to run em out and get the goody out of them, those are much more of a hiway tread so they're on the front (Kelly edge HT, I think). I've had Kelly's before and wasn't real happy with the service life vs claimed but these came with the truck so we're basically "free". They're starting to wear funny though, I had an alignment done at about 5-6000 miles ago with them on there, records showed they only had about 5k on them when I bought the truck.
So they're at about 17k on that pair as we speak.
I'd like to rotate them but I don't want HT tread on back and AT on the front which is what I'd have if I did rotate them at this point, (and winter's coming) I may just swap sides with them and see if that helps because that would at least reverse the direction on them.