I have an Apple watch. It definitely comes in handy for a lot of things. Although, it doesn’t accurately track all of my trips up a flight of stairs. I still think it’s ability to track whether I am sitting or standing or whatever is creepy.
But it's close enough. My wife and I use our watches to track our walks for exercise. There are slightly different results, I think that is due to the different stride measurements between us. You can set the measure of your stride from one foot to the other, for walking or running. We're seniors in our 70's and got the watches for health benefits, but like all the various other functions.
I have one that I use when I don’t want to carry a phone around. It can make calls and take and send messages, so I can leave the phone at home.
My iWatch correctly asked me if “Are you in an accident?” when a car hit me earlier this week. I was impressed. I pressed the “I’m OK” button because I could tell it was like a bad football tackle with no broken bones and painful but not serious.