People keep asking, "Is an apple watch really useful?" - There is no true killer apps.
No, I am not keen on doing exercises. Even I do, I never want to keep checking the figures. Even Roger Federer doesn't wear the apple watch. He said, “I don’t quite understand how much you need to know about all of these little things—about how much energy you burn, about how much spin you put on the ball.”
So, no apps, and I don't care about the "little things".
I still love my apple watch. Recently I bought a leather band for it. Not cheap, it costs me over $1k HK dollars.
It is just a watch. It keeps time. Accurate enough.