i've had them before and there a good tire. you have to remember they are a mud tire and they do wear faster than all terrains but if you keep them rotated every 3000 miles they should last 35000-40000 miles
Hammer: Bearslayer is right. They are a good offroad tire but noisy on the road and they really slip on wet surfaces. I have had the BFG All Terrain and I think they are a perfect compromise between off-road ability and on-road handling. If I had a truck that I used mostly off road or around a farm I might go with the Mud Terrain but if it is a vehicle that is going to spend a large part of it's time on the road, I think the All Terrain is a better choice.
I have the all terrains. I have a F150 that is loaded with work stuff all the time and has a contractor cap on it. I get 65,000 to 70,000 from my these tires. I am on my third set now with this truck. I have only been stuck one time and that was in my back yard. The truck sunk to the axles while loading wood into it. Highly recomend the tire as a great on and off raod tire.