Yes, I have done the tour twice, most recently in October 2006. As big cat sanctuaries go, it may be the nicest. Certainly has very large habitats. The downside is they are only open to the public one weekend a month, for guided tours, and you must reserve in advance online. The location is in a canyon with a stream running through it - very scenic. The other downside is that visitor amenities are very sparse - only public restroom is an outhouse and no food stand (though there is a small gift shop). Also, you must stay with the group - no wandering on your own, although they do end in a grass area where you can relax for a little while and eat a sandwich if you brought one. Since they hand-feed many of the cats during the tour (like in my liger photo), at least you get to see big cats doing something other than sleep.
If you're in the area and you have extra time and money ($35/person), you may find it enjoyable. Could be combined with a trip to Exotic Feline Breeding Compound, which is further up the same freeway (California 14).