To answer your question, YES, it's worth it.
They've got something for every skill level and an incredible amount of trails. Yes, the prices are a little steep, but the cost of operating a 2700 acre park is no small task. Yes, there are perks to paying the $50 membership fee: shower facilities, $10 for entry, ability to access the park when it's closed to the general public, etc.
Camping is free with your admission, there's an up-charge if you need electrical hook-ups.
If you want to ride some real quality trails, this is the place to be. We'll continue to post whenever we plan on riding, feel free to join.