I have one, the latest "top of the range" version and I love it. I like the ability to personalise it with straps and watch "faces". I like the fitness tracking and health monitoring aspects. I love the Bluetooth music streaming and podcasts straight to headphones. I hate to admit I love the ability to take a phonecall straight to the watch but realise I look like a complete pudding. I haven't set up Apple Pay yet but I'm sure I will use it.
All this said it will never replace any of my mechanical watches and I realise it will probably end up in the recycling in three years time.