I went there the other day when it was wet and muddy and were the only riders there. We only really rode the Erina side of the mountain but had a ball. Looks to me like the locals have just started building trails and putting in berms, jumps, drops and gap jumps. The place has heaps of potential. Bumped into a downhill track that looked pretty serious. Not for beginners. Here's hoping the rangers don't get upset with the trails popping up. Definitely going there again real soon. Might even help push a bit of dirt around.
How to get there:
Turn up Karalta Rd behind Erina Fair and then on to Bronzewing and keep an eye out for the trailhead entry on the right.