One week update of the Mi Band 2:
So it has been one week since I first got the Mi Band 2 from DX.com and I am still very happy with it. I am taking waaaay too many HR readings!
I also bought the Mi Band Tools app (R30-odd) to customize my notifications a bit more than what the Mi Fit app allows. You can set DND times, custom icons (up to a point), custom vibrations and a bit more.
The battery is currently on 43% and it has tracked me through about 200 HR measurements, 21km total distance or approx. 36'000 steps. It also vibrates and shows a notification on all calls, messages, e-mails and I have it set to track my sleeping patterns and wake me with a vibrating alarm. Oh, and I also use it as a Smart Unlock when it is near my phone