Just got the watch ( with the best buy pricing being dropped down), I don't like the band that much but since it's interchangeable that's fine. I took the watch off 6am and it is now about 3pm, my battery is at 14% which sort of sucks for I used to have the moto 360 sport. I can't seem to find a place to buy another charger either. But overall I'm getting used to the watch. I think the battery though is what is definitely killer. I have it hooked up with my Pixel XL.
The battery will settle in. Make sure maps isn't installed as it is a battery killer.
Agreed, also wifi off and gestures rather than display always on. Also the 1st day with any new electronic toy is always a battery killer. You know lots of having to check everything out.