I recently (June) bought an Air too to replace my 5 or 6 year old Apple Watch.
I'm enjoying it for the same reasons. Longer battery life. More comfortable when I'm sleeping since it has no buttons or weird bulky shape.
I do wish Apple would make their own version of it with apple pay.
Too bad the Google Health app (which is required for FitBit devices since Google retired the FitBit app) is getting mostly 1 and 2 star (out of 5) reviews on the Google app store.
The reviews were ~90% 1 & 2 star within the first month of the FitBit Air release.
Three months later, the app has improved to ~80% 1 & 2 star reviews. At this pace, they'll be on v3 of the device when app reviews are decent...
They force everyone to move over to a different app when the replacement app doesn't have all the features/reliability of the old app.
Genius.
Garmin released the Cirqa band at $199 w/o compulsory subscription a few weeks ago. I may switch to that if the FitBit Air acts up.