Robert Bonomi wrote:

....
The downside to the Sawstop is the _cost_ of an activation. measured both
in time and money, it is non-trivial. circa $80, as I recall, for the
'replacement' cartridge, *plus* whatever damage is done to the blade.

Which would undoubtedly be considerably extended in medical costs and
likely in missed work time, irregardless whether the woodworking is
professional or hobby....

Which leads the issue of 'false positives' -- those cases where the thing
triggers off for some reason _other_ than a human body-part in contact with
the blade. This is an issue that *NOBODY*KNOWS* how likely it is to occur.
It is impossible to predict what might happen in 'uncontrolled environments
that could trigger the safety device.
....

Well, the rate could be pretty well predicted on the basis of extensive
testing which I would presume they would have quite a bit of...I'm
unaware of them having published any data from which to draw any
conclusions on either side. I would suspect they will have a pretty
good idea before they commit to production, however.