Got mine this afternoon. There is definitely a learning curve simply because it's so different than anything we've had before. It's not a quick and easy transition like picking up a new phone or when we got the iPad. A couple of thoughts on what I've seen so far.
- I'm a big fan of ApplePay so I was curious how that worked. You have to reauthorize cards that may be active on your phone for use with the Watch. Once I figured out the setup process I had the opportunity to use it at Subway for dinner tonight and it worked brilliantly. It will take some time to get used to no visible feedback like I get on the phone screen but I'm thinking I'll get over that quickly enough

- Even apps that have not been specifically updated to support the Watch are capable of sending notification alerts. In my case my favorite Twitter app (Tweetbot) hasn't been updated but I still get notifications on the Watch (even when I'm across the house from my phone) of Twitter Mentions and DM's. If the app has been updated, you can respond to those alerts as well.
- I've got a trip coming up in a few weeks and I'm looking forward to having the boarding passes and gate and departure notifications and updates on the Watch so I don't even need to pull out my phone for that.
- You can select what you get notified of on an application specific basis so you don't get overloaded with things. It will take some time to get used to the right options for me and I suspect I'll over alert at first and need to pull back over time.
- Pretty much every configuration parameter of the watch including what apps are installed and the settings of those apps is all done in the Apple Watch app on the phone. You can manage notifications as well as add and remove apps and change the layout of the home screen right there.
In general, while it will take a little time to get used to it and get it setup correctly for my use I'm pretty happy with what I see so far and really intrigued to see what developers do with it going forward.