After testing 8.5.2.0 I will stay on this ROM. ROM is stable and work great on my Mi5 phone.
Installation type: Standard upgrade from 8.2.2.0 to 8.5.2.0 with TWRP 3.1.0-1 (power on + Volume up, in TWRP I select "Install" then select downloaded image, and finally without Wipe Data (only Wipe Cache/Dalvik).)
GPS test: I test GPS with
Waze,
Uber and
Sport Tracker and in all case GPS very fast find my location and work perfect.
Bluetooth test: Work in my CAR system as "Free hand" for incoming/outgoing calls and as Music player.
Fingerprint sensor: Without lag, perfect.
Cellular/VOLTE/WiFi: Working nice, only now I see LTE+ (before update I see 4G) but all work. WiFi connect without problems. VOLTE I can enable or disable but I not sure how to relly test.
Play Store working: Yes
Battery use: In my case, same as 8.2.2.0, one-two days depend on usage style.
Recommend update: Yes