Check out my readers rig gallery, I am running the ProComps 325/65/18's. I have about 3500 miles on them so far and they are great, they aren't any nosier than the BFG's I took off.
As far as the air pressure, I am running 55 front and 40 rear. I don't do any towing so this is the pressure set up that works best for my truck. With 55 front and rear my truck had a rear end bounce over little bumps, and it was obvious that she was riding on the center half of the rear tires.
Overall impression, they are a great tire, I will know more as I rack up the miles.