I've been wearing my Ring for a little over a week and have found the data to be very questionable. The sleep tracking is obviously not accurate since it seems to log all prone time as asleep. This morning I woke at 4:15 am and went to the bathroom and never went back to sleep, but the Ring indicates I slept again before getting out of bed for good. This is pretty common, so I don't have any trust in the measurements the Ring is reporting.
I also find the activity tracking suspect and sometimes the Ring doesn't even transfer data to the phone. This device is definitely not ready for prime time. It's a shame because I really like the idea of self-quantification and how it can help.
Bottom Line: No, I would not recommend this to a friend
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