I like those rings and love the idea of wearing a normal watch.
However according to this seemingly well written review you would be better off buying a Fitbit every year or two and throwing the other away.
The Fitbit I will be way more accurate and a fraction of the cost.
The newest Quora Ring 3 cost up to $350 and in addition you have to pay a monthly subscription fee of $5.99 a month, almost $72 a year each and every year after buying it for up to $350 for a device that is less serious fitness device than a Fitbit .
I would think buying a new Fitbit every once in a while would not only be a better and more accurate device to use but at a fraction of the cost. The ring not to be taken as a serious fitness ring, unless you want to wear the watches you love.
https://www.menshealth.com/fitness/a44110211/oura-ring-review/
(ps as you know I have an Apple Watch and I get it, I really miss my analog watches but pick your poison)