We just bought into the Six Flags Vacation Club last night. It's a lot like
DVC.
With SFVC, it costs $220 per point to buy in. The points per night are about on par with WDW. And just like with WDW, you'll always get accomodations right next to the theme park. In Six Flags' case, it's usually a Motel 6, but that's basically the same as Disney from what I've read on here.
An exclusive SFVC member perk is $6 off admission if you bring an empty Coke can (that's $1 more than non-SFVC members!).
We're thinking of adding on the Six Flags Dining Plan, where for only $50 per person per day, you get a hot dog and a hamburger every day you're there, plus you get an unlimited refills drink container that you can't take on any of the rides and have to pay $5 per ride to park in a locker. It's a really good deal.
I'd look into it if I were you!