I was a huge fan of the IDEA of the Nest Protect. The reality? Not so big a fan. I think they oversold it. It's still better than my old smoke detector in that the pre-alarm warning is fairly gentle, but I'm still getting on a chair to tap the "shut up" button. Wave-to-turn-off never worked for me even before they disabled it.

My brother bought one, while I was still in the honeymoon period of mine. His false alarmed constantly, and has since been removed.