Ran masher 2ks on my MT2 I liked them alot. I was able to drive up curbs, and on most terrain with them.
Only thing that was negative about them was the truck couldn't take turns going full speed without flipping over, whereas before it never flipped. Only reason I stopped using them was I bought a set of 4 tires and rims for a lightning GT10 for $12 or so off Hot Bodies during there garage sale earlier this year. The new tires are the same height and with of mashers so it hasn't impacted the performance much (they are a bit heavier though).
Main reason I replaced them was 2 of my mashers were new and 2 were pretty used when I got them, and the used ones needed to be replaced cause I wore them out(the 2 that were new don't show any wear) and lets face it 4 new tires for $12 beat 2 tires for $20. Now there on my stampede seeing it don't matter if the fronts are a little more worn than the rears on it seeing its RWD where as before I had them on a 4wd truck and their was a noticable difference.