I initially said I wouldn't buy one...
...because I wanted a watch for running that I could also wear as a normal watch. I ended up buying a Garmin fenix 3 which is fabulous and doesn't need an iPhone alongside to record my route. It also does a lot of the smartphone integration stuff and is waterproof.
And then I bought one for my partner (who does run with her iPhone) and she loves it. I like the idea of being able to do my death by Powerpoint training slides remotely using the swipe gesture. I love the way it also serves up messages in their correct formatting when send by my partner (who's now a fangirl). But most of all I now only have the incredibly heavy fenix on my wrist for the actual running. And I have a really smart, lightweight watch that I can use to see incoming messages with the flick of a wrist and can answer calls handsfree especially without my iPhone in my hand or pocket.
As for the daily charging? I do this with my phones anyway, so another plugged in next to my bed is no big deal.