i using them for almost 2 years already.
All of them also china version.
item i using:
1. Yi IP Cam (more update, more buggy, maybe china version? always cannot connect)
2. Gateway (as gateway, need to off the sound, else each time press the switch, will have ding dong)
3. 5 x switch (button) (put a various places, door x2, bed side x2 and computer table x1)
4. Yi light (main light in the room, no issue)
5. Yi light (table lamp) (extra item, just look nice, need to use bluetooth to control)
6. 2 x Wifi switch (the adapter) (control all the light in my room)
7. 2 x zigbee switch (the adapter) (control all the fan in my room)
8. Infra red controller (no good to use, as got delay and aircon model fail to find inside. can be use on the tv but with the delay, no point)
9. Mi air filter
10. miband 2 (setup when i fall sleep, the yi table light will auto off.)
11. 3 x power extension
12. Mi Temperature sensor (just to check room temp and humidity, din setup for any other usage)
13. motion sensor (din use as never setup it)
14. door/windows sensor (used at door, see anyone open my door when i not at home or not)

all of the item used inside 1 room only. not the whole house.

now is getting better but the yi camera getting more worst.
Always cannot connect and view, need to restart the IP Cam.

gateway need to restart once every 2 months or more, as it stop working.

all other no issue, but sometimes will have delay respond but hardly happen.
The delay is about few sec to few mins. end up like got ghost, lol, the light auto on or off.

the main setup is, when i back home and enter room, 1 button, all on.
fan, light, air filter.
when leave the room, 1 button all off.

bedside switch, control fan and light,.

Actually all gateway connection is zigbee, so do not need to go server,
but those item that use wifi is the one that get delay.
so zigbee work much better and almost never fail before.

motion sensor i not sure, cause never take out from the box before.

i do not like to use the infrared controller for aircon, cause those ion setting will off when use it to on the aircon.
cause the model is not in the list, but this setup is more then 1 year ago.
so now got any updated list or not, not sure, as lazy to go setup it again, lol./.

door sensor got delay or not, not sure, cause i used it as log door open and close only.
should be no problem as it use zigbee connection.