Gary,
Just my 2 cents. Am I qualified? I recon so. I had a good dive instructor. I mastered the basic skills. That being said, I will not do a dive unless I feel reasonably confident that I will not become a statistic. Really the initial call on if I am experienced or not to do the dive is based upon a personal assessment. Yes, I park my ego when it comes to my safety and the safety of the guys or gals that come to my assistance. I DO ask the dive master in charge of the trip what he or she thinks based upon a discussion over my log book.
I received my PADI Basic OW certification two years ago. I am not anxious to go out and collect cert cards just to say I have this cert and that cert. For instance, I could go out and get my advanced OW cert card right now, but I personally would not consider myself an advanced diver just because I attended a course and took a test or demonstrated knowledge to my instructor. Personally, I will get my Advanced cert when I feel comfortable that I can consistantly demonstrate the basics in all conditions, such as currents, limited viz, etc etc.
If you or any other dive operator or dive buddy wish to review my dive log, I'd be more than happy to let you review and ask questions. I sure do ask the same questions when I dive with a new buddy.
As far as equilavency for AOW, I refer to my above discussion. Besides, I feel that you as an operator of a shop and assuming liability to your insurance under-writers, I don't have a problem if you insist that only AOW certified divers are allowed on a trip. It is your call. Again, I will not get my AOW cert until I feel that I am an advanced diver.
Howard