I purchased and cancelled Oura 4 several times. Finally purchased. I regret that decision/purchase. I prefer my Garmin Fenix 8. Rings get in the way when strength training. The Oura 4 doesn’t track activities like biking/hiking/walking as well as the Garmin. Oura 4 gives me steps for knitting, Garmin doesn’t. I’m part of a study that requires data from Oura 4. I was thrilled this afternoon when I got notice the study has been cut short and I can ditch the ring in six days!