how much is it? does it ruin your saw if its activated by accident (I see parts flying and bearing being torqued N twisted) ? I do agree for schools this is a no brainer! I persoanlly would not pay alot of extra money (maybe $100-$500 is fair for the feature but something tells me it prolly $2k per saw
), I would never cut anything I was not comfortable with.
It's not an attachment for any other table saw. It's the whole table saw. And they are priced anywhere between $1600 and $3000. They are built and priced in line with most other "professional duty" table saws I've seen.http://www.woodcraft.com/brands/2390/sawstop.aspx
A replacement cartridge is $70.
I've "heard" that if you cut particularly wet wood, it can trigger the safety but I can't verify that.
I'll stick with my $100 Craftsman saw.