Great in sand and mud, loose trail. I ride a mix of gravel pits and Akeley, MN DNR trails and love this tire- I have it only on the rear of my '93 KDX200 at this point but will be putting the matching front on soon. I've used this tire for maybe a dozen+ hours of riding so far. Note that it is a soft terrain tire and it is "wiggly" on hard surfaces. The trade for loose hook-up is worth it, but some might prefer a soft/intermediate tire for the trails.
Great tire after a bit of use, a bit grabby when new and square edged! Currently on a plated Honda CRF230! Excellent traction on wet gravel roads and loamy soil. Decent in sand and not very good on the road (typical of a knobby).