The last place I worked they replaced the Powermatics with SawStops. The commercial grade SawStops table saws are as good as the Powermatics that we had or better in my opinion. Dust collection is top notch, fence system is good. We did have some Incra miters gauges and still used the miter gauges that came with the table. I have seen the safety cartridge save a few fingers. All you could see looked like 1 layer of skin might have been removed and most of the time, no blood. If you hit the blade faster than normal feed rate there will be more damage to a finger but they still have the finger.
You do need to know if you are cutting aluminum of any conductive material you need to lock out the safety system or it will set off the cartridge. It's no problem to lock out the safety system just holding the key counterclockwise until it signals the system is disengaged then start the saw. The safety system will reset automatically when the saw is turned off so the next time it is started the system is working, unless you lock the system out again.
Also if the material you are cutting has a high moister content it could set off the cartridge.
The safety system is constantly monitoring the saw blade and when a tooth on the blade touches, say your finger, it looks to see if it happens again on the next tooth. If it encounters the second touch it shoves the cartridge into the blade to stop it and at the same time the blade is drawn away from the front of the saw and down below the table. The cartridge contains a chunk of aluminum with holes drill across it, this is where the blade is buried when the system is set off.
Hope this helps,
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