I've seen a guy not lose half of his hand thanks to a sawstop. The tech is good. Most of SawStop's patents have also expired, and SawStop has agreed to make the key aspects that are technically still patented open to the public by the effective date of the law.
This shit is a no-brainer and even a 5 second Google search blows up her whole narrative on this instantly. Loser shit.
More than this, the tech will become an open standard on the effective date of the mandate, meaning anyone can manufacture them for free. The current cost vector is just licensing, your new saw will be safe and still like $500.