My reservation with the notion of a smartwatch is battery life. I care to charge my phone, but I really don't like the idea of also having to charge my watch for mildly more convenient features than my phone.
I have a Pebble, and charging my watch isn't too bad. I usually charge it in the morning while I'm in the shower. I've been trying to sleep with it on for the vibrating alarm. Although, with the Pebble, I can get almost a work week of usage before it dies. I'm not sure how I'd like charging it daily.
There's no indication on the watch itself when it's fully charged, and the battery indicator only appears when the watch has like ~4 hours of battery remaining. Thus it's hard to get a read on just how long the watch needs to charge for -- I usually plug it in overnight once I see the low battery indicator, then wear it for another week or so before the low battery icon shows up again.
As for things to do with the Pebble during the shower: use it to control your music!
