I've had my Ring for four weeks, and it's already cracked. It worked for a few days after I cracked it, then became sporadic and finally quit working within 24 hours. I cracked the Ring doing burpees. I read several in depth reviews online indicating it was the best tracker for fitness training, including CrossFit. I would strongly discourage using this Ring while doing any such activities.
It is waterproof, which is why I bought it, now I wished I'd have waited and saved more money for the Apple Watch Series 2 and the Beddit sleep monitor. I will say I do prefer the inactivity monitor over the Stand rings on the Apple Watch but found the stats on the Readiness Screen of the Oura Ring to be useless. There is no way to delete and download the data, and they supposedly work into the algorithm to calculate your readiness for activity, but I was under the impression I'd be able to monitor body temperature better not just of an average. The labels are so small, and the increments are so close together you can't really decipher any details on the data.
Anyhow, that's my two cents, but you'd have to decide what you really want to use it for. I'm active and use my hands a lot. I don't recommend it for people like me.
Bottom Line: No, I would not recommend this to a friend
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