Yeah its very cool.
I think I saw it first on this site somewhere.....Do a search for SawStop and it might come up. I rang them to find out who my nearest distributor was and the price here, but the girl said it was only available in the US and some or other South American country! From memory the saw is comparable to others in the range, about 2k I think. Might be more widespread now after the few years, and maybe cheaper. The refills for the safety mechanism were pretty steep though, I recall about $120. Then you have to buy a new blade aswell. Thats a poor substutute for keeping you fingers out of the way in the first place!
I think you'd have to be pretty dense not to respect a table saw even with that, but IMHO it would be nice to have it as a backup safety 'just in case'.