Not sure if people are still reading this thread, but wanted to update you all in June 2025. I had an Apple Watch Hermès Space Black Series 5, with battery health 77%. I sent it in for repair last week at the store, and got back an Hermès Series 6! Definitely worth the $99, now that my watch can receive updates with watchOS 11 and later this year 26...
Too bad the blood oxygen app is disabled here in California, can't win them all 🙂