They've lost one section of woods that was previously leased due to a few cretins trail blazing and destroying some off-limits land. I've read that they are cutting some new trail to replace what was lost.
Don't ride MX, so I won't comment on that, but the trails are fun while not overly challenging. The description says "hundreds of miles of trails". Not sure who wrote that, but it's probably closer to 8-12 miles.