I had it for my iP5 for about three days... My only issue was I didn't NEED it... My phone is never away from my sight, so it didn't serve the purpose... Maybe if I was in more meetings when I couldn't have my phone out, but My phone is on my desk or on my body at all times...
Items like that you need to use it to see how you can best integrate it into your life... I am a gadget guy, love the new toys, I WANTED to use the Pebble bad, but I found myself getting a notification (like a text) and then grabbing my phone to reply. I didn't need the extra step.
Not sure about Android, but one of the things that bothered me was it didn't sync your alarms. If you have an alarm set on your phone, it would not carry over to the watch, you had to set a separate watch alarm. Pretty annoying.
my .02