A couple years ago i got an Oura Ring for fitness and sleep tracking. Though I never wore it during any intense fitness activities, it’s nice to see your sleep cycles, resting heart rate, heart rate variability, and how long i sit at a desk. I used the ring and free app for about 8 months before I decided it wasn’t worth the inconvenience. I wasn’t training more than 5-6 hours a week when I used it, so I never had built up much physical fatigue. BUT the data did teach me a lot about good sleeping habits that are talked about on the podcast. It’s shocking to see how long your heart rate stays elevated if you eat or drink before bed and how you can go a whole 7-8 hours without a deep sleep cycle.
I think they’re worth it, but only for analyzing your sleep. The readiness scoring seems to be a little generalized and might rely on months of data to adapt to you.