My first impression was that Apple's Magic mouse 2 is non-ergonomic and difficult to use. After almost a year of use I am completely reversed.
What I like most is the touch function. The ability to scroll and sway easily without buttons and wheels is superb. It is quick to react to finger movements without being hypersensitive. It simply does what I want.
Battery life is very good. I load every month and then I use the mouse almost every day during working hours. However, it is not possible to load at the same time as using it, but if you think about connecting and charging overnight or lunch sometime every month, this is no problem.
That with ergonomics is a chapter in itself. Some like the whole hand lying dormant close to the top of the mouse. I thought I did, too. It was really a habit to get used to Apple's mice being significantly lower. Now I don't miss my old mouse. Rather, I appreciate that I can shape my hand exactly as I want, but still control it easily between thumb and ring finger. With extremely intense mouse work, I can imagine that it is nice for the hand to have more support though.