Is apple watch useful? Which series should I get it?

In case it helps, sharing my personal experience with the Apple Watch Series 3. I bought it on a whim when I woke up one day and decided I'd had enough of being unhealthy and overweight. The hope was that it'd motivate me to get more active, as I'd seen happen with a couple of friends.

In terms of basic features, it does what most smartwatches these days will do – counts steps, tells you your heart rate, receives notifications, stores & plays music, and thankfully, even tells the time :)

The only con for me has been battery life. It lasts about a day on a single charge, but tends to run out a little quicker when tracking longer workouts and the heart rate monitors are active.

But the masterstroke for me was how Apple has used gamification to encourage regular activity. By getting you to close your three rings every day, they manage to invoke this competitive spirit deep within (or at least it did for me). They award badges for your activity-related achievements, which are a great motivator, and they get progressively tougher as you go along.

For someone who's been shockingly inactive on the exercise front for a LONG time, the Apple Watch has managed to achieve the impossible: make me exercise every day, in some form, for 6+ months straight.

16 kilos lighter and a whole lot fitter (and happier), I can say it's been a whim I'm glad I gave into :)​​​

Doubtful, what is the value?

Also very low hat-Life (Plastic, sensitive etc)