The Blag Flag Expert wheelset from SUNRingle quite possibly represents the most complete mountain bike wheelset you can buy. With Stan's Bead Socket Technology (BST) baked in and plenty of options like...
Pros: Fairly light, tubeless ready out of the box. Nice hubs.
Cons: Have broken a few spokes, free wheel hub has come loose a few times.
Recommendation: I purchased these for my hard tail Niner. The hubs sound great, and they are pretty stiff wheels. I'm a bigger guy, and ride them pretty hard, so I'm not sure how long they'll last. but I'm putting them through the ringer.