I've had mine for 3 weeks and have enjoyed the notifications like emails, iMessage, Paper [Facebook], WhatsApp or erm, even the Tinder!
It has honestly made me look at my phone less. I have my Apple Watch on 'taptic' all time from Day 1... Don't think I could stand it bleeping constantly.
Okay, you will need to still to type the majority of replies on the iPhone but when you're doing something and just need to glance at what's come in, it has made a difference for me.
Replying to iMessages using Siri has been reliable. I've done short and fairly longish messages and Siri has been accurate.
I went cycling the other day and tried the 'Workout' app and compared it to 'CatEye' on my bike. There have been a few claims that the Watch isn't accurate measuring the distance, but for me it was pretty spot on. I need to do a few more cycle rides to see if this really true!
Controlling music via AirPlay at home or when out and about is cool!
The Milanese Loop and Blue Sports Band have been comfortable and as I said in earlier post, the ability to quickly switch straps is fun!
Battery life on the iPhone and Watch have been fine. Been out a few long evenings with the Watch off the charger since 6.30am and never gone in the 'red'.
Same as ProPlus, just waiting for the developers to embrace the Apple Watch. Able to reply to WhatsApp or Facebook messages would be the icing for me!