I have a Samsung Gear Live, and I feel naked leaving the house without it.

I use it to check messages, tell time, and change my music. It's nice being able to just glance down and have all the information I need, without having to pull out my phone, unlock it, and check my notifications. It just feels a lot easier, and less rude, because I'm just passively looking down, rather than actively pulling my phone out and using it.