I have mine for a week now, and I love it even more than on the first day. It had to show its real use. Timekeeping and notifications were the main reason I got one. But it's just so cool and easy to perform several actions.
I've never used Siri for example. At least, not for actual usage instead of messing a bit around. With Apple Watch, Siri seems to make a lot more sense to me. Setting a reminder or timer for example. I would always do that through the app, but on Apple Watch it makes more sense to use Siri for this. And there's so many more things Apple Watch can do, where I don't need my iPhone for anymore.
Anyway, I see no reason to not keep my Apple Watch. 😛