I've got a little over 50k miles on my Duratracs now (C-rated, 265/75 R16, 1st Gen Tacoma). Mostly road and light trail duty.
I still have about 10k miles left on them if I decide to run them to the very end, but they're getting slick on wet roads and they have gotten very loud. Still balance and ride great, and the noise doesn't really bother me if I'm alone with the stereo on, but on the interstate with passengers they're "bad mud terrain loud". They got really loud at about 30k miles and have stayed pretty consistent since. You could probably hear me coming down the road from about a mile out......
I really, really want to try the Cooper S/T Maxx's next time around, just worried a little about weight. Although I won't go with another C-rated tire on this truck, so there's going to be more tire weight in my future regardless. My truck weighs too much for C-rated tires.
I would love to hear from somebody with some miles on the S/T Maxx's to see if they got loud or really slick.