carlosn:Thanks for all the (quick) answers. The shop is not talking about experience, but I'll have to check with them. I think that is just their "I don't have to think about it" answer, though it is surprising that they would allow someone with 10 dives, even if they have the AOW.
Ironically it is our SSI diver who is most experienced (20 dives + 2 specialties). The other divers have less experience, and hence are planning to take the AOW class before our trip. The SSI diver understandably didn't want to take the class.
Miskatonic - I haven't seen any info for SSI AOW classes, just the cert level.
I'm glad I understood this correctly.
SSI has an AOW class, you can take the class at any time, however, you will not get your AOW card until you have the required number of specialties and the required 24 dives.
Seems like your most advanced diver could still do the AOW class with no problem, he would get the other 4 needed dives through the course of the class, and he already has 2 specialties. I think you also get two more specialties as part of the SSI AOW class (not sure if those count toward the required 4 though).
More info. on the SSI AOW course is here:
http://www.ssiusa.com/coned.htm