Technology can fail, so why risk it? I'd not trust my fingers to someone else's design either, no matter how good, though I'd be happy to have that system installed on every table saw. But we'll have to wait until the patent expires. Even table saw blades that are protected like that should still command healthy respect and anybody that wants to show off that capability is throwing the dice. It's a bit like driving into a wall at 50 Kph to prove that airbags work. Sure they do. But you may still get injured.