From what I saw, the entire system is more or less single use, resulting in a destruction of the sawblade and the catch. As well as severe shock to the drive. I'm not one bit surprised there is serious opposition to the idea, capitalism and all
SawStop is used at our community woodshop. I've seen it go off (someone touched by blade after they turned off the table saw, but before the blade at stopped spinning), but I haven't heard of it harming the table saw in any way.