That would have done me some goo over a year ago when I was working on my daughter's hope chest. I still have no feeling in my fore finger.
One of the most painful experiences I have ever had.
I wonder what that thing costs.
They've been around long enough that the price is not an issue. MSRP on their website lists $3,732 for their top of the line saw, under $3k for a decent cabinet saw... which seems pretty average to me. Certainly not any more then a similar Delta or Powermatic.
http://www.sawstop.com/I've used one of their saws once, seemed well built. Only downside was the need to change the brake block thing when switching to a dado, means it takes a little longer and you have one more piece to keep track of. But for the safety aspect that's not to bad I guess. Also I've heard that cutting green lumber will sometimes trigger the brake, but any carpenter worth his salt wouldn't be using green wood anyway so that's not really and issue.
EDIT: Also the first line in that video is wrong the narrator says
"The blade has a sensor..." Which is kind of misleading, the blade does not have a sensor, the blade is merely the conductor to the sensor that triggers the brake. Any metal blade will work in their saws.