Whoop for teen?

My 13-year-old is a competitive swimmer and does strength training 2–3 times a week. I’ve noticed a bunch of kids on his team have started wearing Whoops, and I’m curious what they’re actually getting out of them.
I was pretty skeptical at first. These are 13-year-olds. They can barely stop themselves from eating ice cream for breakfast, so I wasn’t sure what they were supposed to do with all this recovery and sleep data.
Do any parents here have a kid using one? Has it actually been useful, and what do they do differently because of the data?
I have some Best Buy rewards I could use toward one, so I’m considering it. Just trying to figure out whether it’s genuinely helpful or mostly another gadget they check for a few weeks.