As for diving with an SSI trained diver - I'd suggest you worry much less about the agency and chat with every potential buddy to understand their expectations, knowledge and experience. I can definitly assert that with SSI's approach that an "Advanced Open Water Diver" requires multiple specialties and a minumum of 24 dives, someone holding an SSI AOW card has a great potential to be a better diver than the great number of "advanced" divers who complete an "advanced course" immediately after completing open water and have an "advanced" card with 9 dives under their belt...
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I have to agree with the above comment. Each agency has it's pro and cons. I find it laughable when I hear of someone who is "advanced" with as few as 12 dives. (Read: PADI)
As for the SSI Stress & Rescue class it is a quality course and is every bit as good as any of the other agencies out there. Much of this will of course depend on the instructor teaching it.
I have looked over the PADI rescue materials and they are written in the same manor and are directed at the masses. I am interested to find NAUI's version as I suspect it is going to contain the same material and will also be written for "the masses."
To come on here and insult anyone who has trained with SSI and their diving abilities is out of line.....it's ok though...I doubt a lot of them would want to dive with you either.
I would just hope that if you do ever get into a situation where you need rescue assistance that the divers aiding you have some form of rescue training from any of the reputable agencies out there.
Gday.