Makes sense. For a $1000 differential on a questionable value, though, I'll put up a good fight with the Mrs before conceding. 
I literally just replaced all of my detectors with 10 year battery models... 8 smoke and 2 smoke/co... $290 from Amazon... Even if they get flaky and only last 3 years I'm still WAY ahead on money versus Nest Protect or other "smart" detectors.
But I get that it isn't always "about the money".
