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The Viking rings twist to lock, and twist to unlock. The SI Tech rings push on and pull off. SI Tech added a screw down piece to ease removal, which applies pressure until it pops right off.I understand that on the Viking bayonet system the glove side twists into the suit side, as per the pdf on their site. Not quite the same as the SI system which is push in, then thread out.
edit: it made no sense!
That said, Dustin had a heck of a time getting his vikings off the other day (needed pliers) so perhaps he can comment on that aspect of them.
Underwater Ogre: I can see the classic rings on their site, I'm having a tough time finding any sort of installation instructions to see how the system works. Do you happen to have a link that would show me how it all goes together?