The Good: The SB8 has 8 very small knobs running laterally through the tire. These tires are very fast and still quite grippy on hard pack trails and dirt jumps. Low rolling mass and resistance means you can accelerate significantly faster and it can shave a good half pound of your bike. It is also tubeless compatible! The middle knobs are made of a hard rubber compound which enables them to roll fast and wear well. The side knobs are made from a softer compound for better grip.
The Bad: These tires are only ideal for XC use on hard pack to medium trails. For a trail bike its good to have it as a rear tire, but its too slick for use as a front tire. A good combo for good grip and fast acceleration would be a SM8 on the back and a Nevegal on the front.
Overall, these are the ultimate tires for hot summer days riding fast, flowy hardpack trails. Fast acceleration, low weight combined with controlled grip on smooth trails will convert your bike into a singletrack screamer. They are also good value and wear slowly so its a worthwhile investment. Definitely a tire to recommend for those seeking some fast tires to race on or just mess around on the local trails.