I ran two sets of BFG mud-terrains before switching to the Goodyear MT/R's which I have had for about one and a half years now.
1. The BFG's were quieter, when new, on the pavement. They definitely got progressively louder as they wear. As a side note they wore evenly (I've never had abnormal wear with my truck) My last set of BFG's had about 75% tread left when replaced and were still slightly quieter than the MT/R's. No objections to the noise, just comparing the two.
2. I really couldn't notice any handling difference on the road between the two, thought the MT/R's seem to hook up better on wet roads....probably due to the softer tread compound and a little more traction elements.
3. Off-road there was a noticable difference. While the BFG's always seemed to do well, the MT/R's just seemed to work better overall. There were some rock and dirt ledges that before I had to pick the right line and sometimes bump a little to make up, the first time with the MT/R's I was able to walk right up with no wheelspin. Again, the tread compound is noticably softer when doing the "thumbnail test" and there are more slits/gripping surface on the tread. The MT/R's also seemed to get better traction in the mud (which there is plenty of around here). Another guy in our club has a set on a Jeep and also really likes them off-road.
4. The sidewall lugs of the MT/R's are a definite advantage. The trails I go on have lots of dirt and mud ruts in which the side lugs seem to grab on to. Also, the BFG's were showing a lot of scrapes and scuffs on the sidewalls from these ruts after only a year or so on the trail. So far the MT/R's aren't showing anything like this.
5. I can't really compare how many miles to expect because the Blazer is pretty much strictly an off-road rig and only put around 3-4k a year on it. The MT/R's are showing wear do to trail use due to lot's of spinning and a few tread cuts, but nothin worse than the BFG's. My first guess is that the MT/R's won't last as long since the compound is softer.
The cost is the biggest downfall of the MT/R's (35's list for around $200/tire), but in my case I can get them cheaper than the BFG's through a friend, which is the main reason I decided to try them.
A couple of other notes in regards to other replies:
- The "old" Goodyear MT (directional type tread) is basically a completely different tire than the new MT/R, so they can't be compared.
- Uneven or abnormal tire wear is almost always due to the vehicle, not the tire. Everything from a bad alignment, worn shocks, worn steering components, or improper tire pressure can cause this.