This is a fast rolling tire. I had it on the rear of my XC bike. Its a few grams heavier than most XC tires but the sidewall protection is well worth it. Great for hard pack and some muddy conditions. Sloppy conditions it does not do well. Since it is a Continental, they are expensive which I don't like but it may last 2 seasons.
This is a solid, big tread tire for all-mountain riding, including light mud and slippery roots. The Black Chili compound provides tenacious grip on wet rocks or woodwork, and the high volume makes it cushy, especially at low air pressures. The 2.2 is true to size, and very much larger than the corresponding Mountain King II.
I'm running it tubeless on an old-school Mavic wheel with Stan's strips and sealant, and it holds air wonderfully. No burps yet, but I'm light.
The downside is that this tire is fairly heavy and leans more to freeride than the trail end of the spectrum, so it might be overkill if you have a light bike and your area has lots of good, dry, sticky dirt.