Comment: Re:he should think this through (Score 2, Informative) 631
One thing that might put you off wanting this feature in all buzzsaws:
If you read StopSaw's "how it works" section on their site, it'll tell you that the brake is a single-use cartridge that costs $69 a pop, and that you also need to replace the blade (presumably also a StopSaw proprietary part)
That'd be all well and good, if the saw only ever stopped when you actually put your finger in it - $200 for a new blade and brake is obviously a small price to pay for saving your finger.
But the site also goes on to explain that the brake is activated electrically, by the conductivity of the human body as opposed to wood.
In order for the saw to stop if you are not touching some other part of the chassis, this will need to be a high-frequency noise detector (like when you touch an audio amplifier input), which are very susceptible to.. noise.
It must be VERY profitable for StopSaw if they get $200 or so every time there is a bit of RF noise in a workshop!