Running stt pro on my 80, 35x12.50. On and off road grip is good, wet roads are good too, the bfg Mt's they replaced didn't grip wet tarmac well, I don't have issues with the coopers. Run 35psi and only air down if doing tracks with bigger rocks, they are designed to flex, normally 25 psi but will go to 18 if I feel the need.
As said they're a heavy tyre, I noticed the difference changing them from the bfg. Not too noisy on the road.