Not had experience of mk2’s but i’ve been using conti mtn king 2.2 supersonics tubeless for 5 years. Had some Speed king supersonic 2.1’s too. Walls are porous to start with but will seal ok. I’m pretty light and tend to skip over stuff rather than plough thru but running at 35psi they have been fine. Riding has been mainly local Yorkshire trails, Peak District and Dalby, ocassional Wales and Scotland. Hope this helps