Here is an interesting article on Android Wear.
5 reasons it's worth buying an Android Wear watch right now
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Android Pay is a surprisingly convenient feature.
Fitness was a huge selling point for me (leave my phone at home, and still have my music and ability to track my sets).
Opening my door with a bluetooth lock was really the key [ummm, no pun intended!] to leaving everything else home.
I opted not to get the LTE version. But there have been times I wish I could make a call or hail a cab - didn't feel like paying $5 extra per month for a feature I'd rather not use.