We've seen a few out there.
Yeah - what John said... Ted usually puts us on one site with several.
With Anacapa and the Spectre, its very low cost, you get 3 (or usually 4) dives in, you can sleep aboard the boat so no pre-dawn drive to get there, the dives are shallow so you get mad BT, and unlike the 'nados, there is something else to see when you're not on the sea lion spot.
The rookery at SBI is a SURE thing, but its a long azz boat ride to get there, and when you're there... well, you're there. Although there is lots to see and dive at SBI, the trip is so long out there that you generally leave the night before, you generally pay an up-charge to get there, and because the travel time is so long you'll usually do your other one or two dives in very, very close proximity to the Rookery. And all of the really great diving is on the opposite side of the island. No one-day boat I've ever been on has dived the Rookery and the good stuff. Its usually the Rookery then some sand hole near by, then hustle back onto the boat to strap in for several hours back home.
Anacapa is just a better, shorter, cheaper, more comfortable day.
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Ken