I've been kicking this can down the road for years, but I finally got a job that involves cutting so much melamine board there's no way I'm doing it with a circular saw.
I watched multiple safety videos before even opening the package, and now I'm just sitting here staring at it wondering whether I should fire it up and cut off a finger or two. I'm fucking terrified of this thing.
Bosch did not have it for ages (10+ years) by now, only Festo and saw stop (same company) have the classic saw stop.
Felder and simlar priced manufacturers have something, but that is based on totally different mechanisms and equipment.
I am not aware of any other companies that have or had a saw stop like mechanism and there certainly never was a upgrade package for other saws (which would have been technically impossible imho).