Your forgetting the MOST important feature of a smart smoke detector, advanced notification that the battery is low and not at 2am waking you up! I went with 7 Nest Protects when I just did a major home reno and had to put something in. I am very happy with them, but of course haven’t been able to see if they worked during a real fire/CO situation.
Home depot had them for $79.99 yesterday but today I can’t seem to find them.