Oura ring- Any users?

All of your comments are consistent with FB Science user group. Oura’s readiness is completely irrelevant for athletes as it knows nothing about training principals, particularly overload. This is discussed quite well in the 18 page FAQ that is required reading to join the group. As for daily activity tracking, similar, it’s primarily a night time device (although many users wear it 24 hours like a piece of jewelry). However, it will be interesting to see how the daytime activity tracking evolves (see announcement).