Comparing them mostly to Swampers - SSR's, since that is what I have run for the last several years - Boggers, SX's. Never run an MTR so I have no idea.
Cost is plenty... you are looking at over $200 a tire. Nearly the same price as the Irok's.
Soft flexie compound on these. Hopefully not as soft at the bogger (its made for mud, not NW rocks).
Oh yea, and they clean out beautifully in all but the worst sticky clay.