I’ve been using them front and rear for the last 1040.3 km (according to Strava). They are the Black Chili Protection version, which I had from CRC.
They went tubeless with no hassle, using just and old Joeblow track pump (on Shimano XT wheels). I’ve used them on various terrains in different weather conditions. The grip is amazing. I think that the wetter it is the grippier the tyres got. I’m not very skillful rider, but these rubbers give me a lot of confidence on wet roots and rocks. I ran them with quite low pressures 14 front 16 rear on mega wet ride a week ago, which included a lot of rocky bridleways – and there was not a moment where the MK’s would slip. Even on very steep gravel/rocks with wet leaves climbs (I mean “chest on the stem” steep, with 22t front and 36t back) the rear one offered constant traction.
I use my bike for daily commutes too. 100% tarmac, about 10 km each way. Yes, they rumble like a motherf####s. Yes, you can feel the vibrations coming from these lugs, especially rear. And on tarmac climbs you can feel and hear the rear tyre almost squeaking… But after over the 1000 km there is actually almost no sign of wear!