Back in 2019, I bought a Fitbit Charge2 when I was training for a bike trip. Was interested in tracking activity duration more than anything else (worked well for that), but the elevation tracking and sleep quality functions were interesting. I've always slept well (the Fitbit seemed to confirm that), but a friend of mine who also bought one did not. He obsessed over the sleep data - even after I forwarded an article to him that suggested most people slept worse when they started to track their sleep data. Bottom line: The ability to measure/track your activity can be a beneficial if you're goal focused. The sleep tracking is of limited utility - most people know when they've slept well and why. I had the interface on my tablet so I wasn't live-synced 24/7, but when Fitbit became assimilated by (Google???) I stopped using mine. Display was about shot on it by then too. The amount of biometrics that could be gathered so easily/simply then was both impressive and scary to behold. Imagine what it gathers and sends now.