1. Battery life. The initial reviews complaining about battery life are simply inaccurate. I have ambient mode on (always-on screen) which is supposed to kill battery, and am easily getting a day out of this watch (ending 16 hour days with 20-30% remaining). I'm using the watch all the time to read emails, respond to messages, etc. If you don't believe me, check /r/moto360, you'll find a bunch of people who actually have the watch corroborating that the battery life is perfectly fine.
2. Size. I have tiny wrists and it looks great on my arm. Not too thick or too big at all, and very much on par with typical men's watches. The fact that it's very light helps too.
It's a fantastic device and I'm really enjoying it.