They're pretty good, though battery life is an issue with some firmware revs. (n-2: bad, n-1: 100% better, current: iffy). So far my wife's ring has lasted well

They're pretty good, though battery life is an issue with some firmware revs. (n-2: bad, n-1: 100% better, current: iffy). So far my wife's ring has lasted well longer than my Apple Watch.