I just tried integration with google home. I'm on the Chinese server and it really works all very well without any lag! already a few days the Chinese servers are working really fast, at the opening of the application all the devices are updated within 2 seconds. I inform you that it is necessary to tell google home "synchronize devices" after having associated the mihome account with google assistant. I almost forgot, for those who still do not know, I write from Italy. now I'm waiting for the integration with all the other devices (I can think of the smart socket, hoping it will become compatible, I'm talking about the previous zigbee socket, not the last model just released). finally, without too many tricks you can integrate everything to google home for voice control.
EDIT. I do not know if it is a limitation of integration with mihome, but I can not change the color of the lamps. at least we can turn them on and off, it's a great step forward.