I stopped over at the saw stop site and took a look at their products. Interesting little gizmo, expensive, but very interesting.
I think if you're looking for an absolutely safe saw (from the blade anyway) this puppy just might be the ticket... Though I didn't see saftey bumpers on the corners, soft side cushions on the case, or an airbag type appliance incase of kick backs. And WHAT ABOUT THOSE BLASTED SPINTERS??
Ok I'll be serious for a moment, well as serious as I can be anyway... It looks like somebody put a lot of thought into this and if it works as claimed will save many a person from having to answer questions from their grandkids about why they have to take their shoes off to count to ten. However, with all new technology it's expensive. And anytime you ask a typical woodworker to lay out more cash...Well, let's just say it's not a good thing and leave it at that.
As for mandating that it be installed on all saws. That's an entirely different thing. Now you're encroaching on our rights to injure and maim ourselves in creative and painful ways as we see fit. I agree with everybody above who says "if it's that good a system, it will sell it's self and everybody will install it" The price will come down and like also stated above it will be just like any other feature "standard" on the saws.
Trying to mandate something in the US does tend to raise most folks hackles, we're a bit stiff necked about things when somebody comes up and says "This is how you're gonna do this, by the way you don't have a choice". Even if it's for our own good, we tend to be stuborn types.
I am kinda curious about a few technical aspects of the system. Not everybody keeps their shop in absolute perfect condition, some aren't weather tight, some are damp basements... How does this system handle adverse conditions. If it's relying on monitoring an electrical current through the blade will rust effect it?
What about nails? (I realize we should inspect our wood etc, but it does happen) Will hitting a nail in a piece of wood cause the safety to trip? I'm thinking hitting metal will cause a rather abrupt spike in conductivity and there by blow the stop. A block of aluminum hitting a spinning blade means that blade is toast, at $70 a reload plus $50 (or more) for a new blade, that's an expensive mistake. Does the saw function if you don't reload the cartridge?
For industry I'm thinking they're doomed to have to incorporate it. Insurance companies will make it happen if nobody else does. As with all things it will eventually trickle down to consumer level products. But just like the gaurds that are supposed to be on our saws now, how many are actually in place? I think that that will be the fate of this device as well for most of them.
My humbe two pennies worth of rambling... Take it as you will. :-)