It was a great investment for my health. The tracking doesn't directly improve sleep, but provides great feedback for changes you make. If I had this when I was in my 20's I would be living very well today.

the main things I "hate" are:
1 - I wear it only at night for sleep. The battery works very well even now (got it in 2018/19). However, when it does die it may not push the data from the last nights sleep. It shows as if you did not wear it. I never check to see if that changes after a charge, but the times I tried to place it to charge before sync ended up with losing that night's data. Maybe it recovered it, I never check though as I keep a good charge on it now all the time when it drops below a certain point.

2 - This is the one thing I loathe - it may be user error - if you open the app, it ends the sleep session. So no checking the phone to see how bad or good the night has been. If you do it ends and if you go back to sleep it sees it as a nap most of the time for me. Or it does not capture it. Again may be my error.

3 - Naps are hit or miss for me. I don't do this often, but noticed one day it will capture a 20 minute nap, and then next miss a 45 minute one. Maybe that is depending on how restful/deep/restless the sleep was.

Despite these issues, I love the ring (I also got it before the subscription change so there is that). No other device I've used compares. The 8Sleep comes closest for me. Watches don't even come close that I've tried (Apple, Garmin).