I'm using it on my Amazfit Pace right now. Standard US/English ROM.
I used APKInstaller on Windows to install the APK to my watch. I then followed the prompts in the phone application to connect the phone app, which I downloaded from the Play store, to connect the phone to the watch. It was pretty simple. Here are screenshots of it running on my Amazfit Pace.
After a few days using the app , this is my opinion:
-I don't have problems with disconnections at the moment, the app is going great.
-I am using it without the official amazfit application, since I uninstalled it from the phone and I realized that, surprisingly, I was still receiving notifications and calls, which is all I need from the watch.
-I've lost 2 days of battery (6 to 4), but I have my disconnect warning , and for me this is more important.
you can find the latest beta here: https://mega.nz/#F!jRliEagC!fhmInkv1FIfmqcFor_jpMg
open up cmd and run:
adb install -r watch.apk
after that, if you have no access to the applications drawer on the watch, type:
adb shell monkey -p com.lumaticsoft.watchdroidassistant 1