I saw this first a few years ago. Pretty cool.
My big concern is false stops because of wet wood. This was listed as an issue in other demo videos I have seen.
I don't know if things have changed, but as of a couple of years ago the industry hadn't bought into it (the industry meaning making this somewhat of a standard safetly feature -- not to say some manufacturers haven't started using it) because of people getting complacent (among other reasons).
I think this is very cool, but I do have to think people will start getting careless when they know it is installed.
Knowing your finger, hand, arm, etc. will be removed if you do not respect the machine does make you proceed with caution.