Octane Boosters

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I need some input on octane boosters and their claims to boost octane. Some don't even cite how many points they will boost your octane. All that being said, can anyone recommend a brand and/or if the stuff is really worth it? I bumped my initial timing to 15 degrees with full advance at 2800 rpm. Since the car is so noisy anyway, it's kinda hard to hear any light pinging under low rpm load. Comments?

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There's a bunch of threads and posts on that very subject here.
http://www.clubcobra.com/forums/sear...der=descending