[yock]

That night if you had asked me to pay $100 so that I could go back to sleep and not have to worry about THAT CHIRP, I would have whipped out my wallet so fast.

See, you say that, but it isn't just one smoke detector. It's ALL of them. My small house alone has no fewer than 4 plus a CO detector. That's $500, real money to save me from an occasional hour of lost sleep or, at worst, an extremely rare night? The value proposition just isn't there.