Cons: Thin sidewalls
Recommendation: Although mounting can be a little difficult, these tires are great. Good rolling resistance with amazing grip. They have dual compound which help with wear and cornering. They shed muck pretty decently and come in a variety of widths. They have a thin sidewall but you can get the UST version and run tubes.
Pros: Good grip, even in Hard/Loose covered with Leaves and snow. Rolls much better than other brand. Relatively light.
Cons: Not true to size, 2.1 is more like a 1.95.
Recommendation: I switched to these from Nevegals. I like the Nevegals bite, but hated the rolling resistance. I just rode these in loose/hardpack covered with snow, and I never felt as though they were going to slide out from under me, good bite in the corners, fast roll. Run the 2.1 as the front at 40 psi with WTB Exiwolf 19.5 in Rear. 2.1 is a little on the skinny side, so I may go with 2.3 next time.
Cons: Very little cornering grip. The treads get packed with dirt quickly and your basically riding a slick.
Recommendation: At a glance these tires look like a great XC tire with a rounded profile and medium knobs. They do roll fast, however, they pack up with dirt and lose grip on anything other than hardpack. It feels like your riding a slick tire in the wet all of the time. Nice for drifting the back wheel though. I got rid of these tires for small block eights, which dont look as grippy, but always seem to handle so much better.
Recommendation: I paid $50 for this tire at my LBS. It's durable casing is enough for downhill, yet light enough to climb. The treads seem to be wearing at a reasonable rate too. So the tire should last for a good amount of time.