i had to ride with Mountain Kings for a while as they were on the work bikes, and consequently my guide bike.
the old MK was fine if you intended on not making any turn at anything above walking pace.
i lost several side knobs on the new MK on my first ride with them. they gripped ‘ok’, but weren’t amazing. got back to the shop and realised that the side knobs were missing. swapped them out for Rubber Queens.
RQs are good. i’m currently running 2.4 BC/compound. my only niggle would be that the sidewall protude further than the side knobs. i ripped open the rear twice in two rides. two nice 1″ long slits about 3″ apart. brand new tyre! sewn up with dental floss and patched over (from the inside) with a section from the old MK that lost its sidewalls. but, that was riding in very rocky terrain where there were loads of loose, sharp rocks everywhere (Gran Canaria).
so no, don’t bother with MK, IMO.