The AT/3 seems quite a bit different and supposedly improved from the old ATR. I liked the ATR....and I was very tempted to get AT/3s. The CTS is supposed to have quite a bit of tread life/longevity. Its too early to tell how they are holding up, but the tread is very "deep," so even if it wears quickly, there is so much rubber there it will take a while to notice. Supposedly the CTS is a "light truck heavier duty" version of the CS4s. There was a rebate programing running when I got them (similar to one going on now thru October?) that made the CTS only something like $2 a tire more than the CS4s. That made that decision easy. I almost went with the AT/3s, but I don't really need the "All Terrain" capabilities, and I liked the mileage and the handling of my General Grabber HTS. The CTSs seemed similar the the Grabber HTS in that respect. add it all together and the CTS was the best bang for the buck & the best tire for the job.
I need to put more miles on these things to really say anything with certainty, but so far these are very good/great tires. My Hoopty Civic (100 mile/day commuter) has some issues, so i'll be using the E for the next few weeks as a commuter again, not just a weekend family adventure wagon.
Thanks!
Will