Heres my take as a smartwatch wearer for over 2 years.
The pebble I own is GREAT for ignoring things.
Buzz - Its FB, nope dont need to look
Buzz - work email. Not important, write back later
Buzz - its personal email, the wife asks me to bring home gravy for the chicken - got it.
Buzz - its a call. oh, its this dude, sure Ill pick up
Buzz in meeting - important boss calling, time to politely leave. but without taking out phone.
These are the things ive gotten used to with just a dumb display.
Now, I will have the ability not only see them without taking my phone out 260 times a day, but 80% of these i can view/reply without even looking at it.
Add in the music 'remote' feature for when your working outside (thats cutting the grass or whatnot to me) because the phone is wired through your shirt so the headphones dont get caught on anything..
It is not an amazing new set of tools. What it allows you to do is do things youve done before but much more easily and simply.
Plus it should look pretty snazzy!