Very low battery power, less than a full day......
I chose the middle. Not so user friendly - granted I'm tech challenged. I'm a Citizen man so it was , for me , the logical - "Smart" choice.
The Google user interface (app) that this watch depends on is not so great. And when compared to a FitBit interface (app), it completely fails. As others have said, the battery life is terrible, especially when compared to a FitBit. I like the look and feel of the different faces, but due to the lousy user interface, this smart watch misses the mark. But Citizen could easily remedy this by demanding a better app from Google. But the battery issue is here to stay.
If you plan on using all the watch features for Fit you will have to charge the watch daily. And if you forget you will lose track of what you did like steps. Plus the steps are not accurate at all.