The new power saving mode is brilliant. I can get full 3 days out of an SE model by switching off extranier functions like the HR monitor.

That said I was in hospital recently and they wanted to keep me in because they were worried my HR was too high at which point I could show them my stats from the last 2 months that this was a result of my fitness (another issue....) rather than the infected tick bite I had gone in with.

Without my Apple Watch I would have been kept in overnight for no reason and taking up space someone who was actually seriously ill could use.