12 - 29983 mi - Bridgestone Dueler 684 II P265/70R17 SL (Stock)
29983 - 51533 mi - BFG KO2 LT275/70R17 E Load
51533 - current (~66500) mi - Cooper Discoverer AT3 LT275/70R17 C Load
Stock - Highway tires, decent on-road traction, did fair dry off-road but some spinning in loose dirt. Most impressed with deep snow performance. Overall lots of bounce, lean, and nose dive. Absolutely not for mud or ice!
KO2 - All terrain, glacial treadwear. Noise was good for an AT, more of a whirr than a whine, and not noticeable without the windows down. Great on road traction reduced nosedive. Initially good performance in snow, decent on ice, good traction in water, but threw a lot of spray. After first 2/32 of tread were gone the performance in damp and wet condition handling deteriorated, ABS kicked in more frequently, wheel spin and slipping occurred more often. Over all a mixed ride, properly inflated was stiff and slightly rough, slightly under-inflated was mushy and sloppy in turns. In the end I decided E Load was not my liking, and the degrading wet weather performance was a concern as I have to get to work in all hours and conditions. Had the tire performed at 20kmi as it did at 0mi then I would have probably just dropped to stock sized C-load.
Disco AT3 - Almost bought these instead of the KO2, but was seduced by the grand reviews and sexier look. Should have ignored the KO2 hype and stuck with tried & true performance.
All terrain, good all around tire. Low noise, smooth ride, agile, good traction. Do very well in rain, snow, mud, or sunshine both on and off road. Not as aggressive as the BFG KO2 or Falken AT3W but good performance for the daily driver who also does trails. Not necessarily my pick for the Rubicon or Baja, but I'm not running those trails.
I've got a good long while yet to run on my Disco AT3's, but in the future my other considerations may include in no particular order:
Cooper Discoverer AT3
Firestone Destination AT
Falken Wildpeak AT3W
Dick Cepek Trail Country
Dick Cepek Fun Country (I had the older FC-II on my 92 Bronco which was only lacking in on ice)