Frank,
Welcome to the Creek and the ongoing saga/debate about SawStops. I'm a hobbyist who bought the SawStop contractor's version about a year ago and I'm very happy with it. no problems with the fence, accuracy is great, and the saw seems to power through almost anything I ask of it. Customer service is quick as well - when I unpacked mine there was a fence locking handle missing. One phone call and the handle was on it's way without any argument.
For the last several months I've been teaching some local kids about woodworking on an informal home-school kind of basis. I'm not a teacher by trade, and they're not my kids so I'm very anxious about safety in the shop, and I haven't let them use the tablesaw yet. But I have showed them the braking system and how to use a tablesaw in general. My thoughts are that the kids should be given the knowledge that the saw 'should' help prevent serious injury, but the brake won't activate unless they do something wrong - which will result in at least a minor injury. The owner's manual is very clear on this point - that an injury (albeit a minor scratch) MUST occur in order to trigger the brake. If there's a way to make the kid's responsible for the cost of a new blade and brake, make it clear that any activation - accidental or otherwise - will result in them having to pay the $1oo or more to replace the brake and blade.
When buying the saw, be sure to buy an extra brake system for both the regular blade and for a dado blade. Otherwise the saw is out of service until new cartridges come in. Better to have them on hand so that there is only a short delay while a new cartridge and blade is installed.
I have had two incidents of false triggering of the brake (expensive mistakes). One was when I cut into a hidden screw in the jig I was using, the second was when cutting some cedar that was a bit wet. Both cases were due to my own errors, and while I grumbled about the cost of replacing the cartridge and blades, I;m still glad to have the safety feature. And NO, I've never had the slightest urge to stick my own finger in the blade to test the system!
For what it's worth, I'd think the liability for NOT having a SawStop would be huge in your case. A parent contemplating the end of a child's dreams of being a concert pianaist would be quick to pounce on any school that failed to provide this safety feature. Consider a driver's training program that chose not to require student's to wear seat belts.......