There's a recent review and test between Sawstop and Bosch here
https://www.protoolreviews.com/tools/power/corded/saws/bosch-reaxx-1041a-vs-sawstop-jss-mca/14982/
Sawstop has a lawsuit against Bosch currently.
The biggest gripe against Sawstop is how the patent owner attempted to force his system on other manufacturers through government regulations which failed. I've never read anything suggesting the saws weren't well made and I think it has a place in industry and trade school situations where inexperienced operators might be using. If I had a construction crew or cabinet shop I'd certainly invest in one. As for a hobbyist or owner/operator it's up to the individual. I know to keep my hands away from the blade, but others aren't so certain. Kickback is more of a problem from my perspective.
The Sawstop "inventor" did more than just try to force his technology on other manufacturers thry goverment regulation, although he did do that as well.
After "inventing" the technology, he tried to license it to various tool manufacturers. One of the manufacturers found a problem with the technology. If you tried to use the saw to cut certain materials, like pressure treated wood, the Sawstop system would falsely trigger. Gass, the "inventor", hired an engineer to solve the problem, but the engineer couldn't find a solution, so Gass sued the engineer.
Gass was in talks with various tool manufacturers to license the technology. I'm not sure of all the tool manufacturers, but I remember Emerson, Ryobi and Black & Decker being mentioned. I believe the contract with Ryobi specified a 3% initial licensing fee as a first adopter, with the fee rising to 8%, if the technology were adopted industry wide. I'm not sure what % he eoukd have wanted from other manufacturers who adopted the technology after that, but I've read the fees were way to high for manufacturers to absorb given typicsl margins. According to one if the lawsuits Gass and Sawstop initiated, Black & Decker offered 1% which Gass considered disingenuous.
After negotiations to license his technology failed, Gass tried to get "safety" legislation passed in at least one state that would have required tablesaws to have all the features covered by the sawstop patents, although the legislation did not specify Sawstop specifically. There was an outcry about the legislation, and it was allowed to die without a vote.
Gass, the Sawstop "inventor", also decided to sue the Power Tool Institute, which represents major power tool manufacturers, for conspiring to prevent Sawstop technology from becoming industry standard, by adopting new safety standards, and having its members cease negotiations with Sawstop. I believe a few members of the Institute may have settled with Sawstop, but a judge later threw out the lawsuit claiming evidence that Gass's claims were false. There's a summary here.
https://www.consumerproductmatters....-halting-sawstops-antitrust-lawsuit-released/
Gass also started testifying in lawsuits brought against power tool manufacturers involving instances where people were injured using tablesaws. A number of the lawsuits were brought by insurance companies trying to recoup payouts from workers comp insurance claims involving injuries from tablesaws. Gass was brought in to testify that if his Sawstop technology was part of the saw, the injuries would not have happened. At least one of the lawsuits involved a large verdict, but in another a manufacturer was found not at fault.
The sequence of the above events may not be exact.
Using capacitance to detect the presence of flesh near a sawblade is not "new" technology. There were at least one or more patents prior to the Gass patents related to the Sawstop system that mention capacitance to detect unsafe conditions on industrial cutting equipment. One of the patrnts even mentioned its use on circular saws, and the patents were issued close to ten or more years prior to the Gass patents.
If Gass had simply tried to sell his technology to manufacturers, failed, and them started selling his own saws, the reaction would probably have been much more accepting. Instead, his actions have basically made a large number of woodworkers to never want to purchase a saw or ither item from Sawstop, even if they may be interested in a similar technology.