I ordered the MTS in 35R20 for my FX4, replacing a set of Mickey Thompson Deagan 38' in the same size...
First impression was that this is one bad baaaad mamma-jamma! They look like no other tire, but they also function like no other tire....
When I bought mine there were only a few reviews so it was a real gamble but I feel like I hit a flush on the river. These things grip a road like no other tire. The feeling was a MAJOR difference between the Deagan 38. They glide. And you feel glued to the road, because you ARE. The sound? What sound? There is no sound. It was such a huge difference that I was able to hear and feel and diagnose that I needed to replace my shocks and a few other suspension parts.
Now these are not going to be quite as effective in mud, but I live in south Louisiana and we have clay rich gumbo-mud or quicksand, so there's no practicality driving a full size truck many places so muddy you need more traction than these provide. What these do exceptionally well, is drive safely in south-tropical torrential rain and through deep pools of water. I drive from Houston to Baton Rouge, in a tropical storm, through construction 1/3 of the way, in the middle of the night, safely cruising at 70mph!
Federal underplays the traction of these tires and their functionality. Sure, they look wicked, but they do it while doing what 90% of truck owners need them to do....but I can't lie, it's fun to sit in the parking lot if sporting goods stores and just watch guys reactions, cause everyone has to check them out haha.
Would I buy them again? You can bet in it. Great tire