Hello, I am a current owner of the older 940mx Mi Notebook. One troubling issue is the possibility of fan failure. The fan buzzes and sounds as if it is grinding against something. Here is the video I shot:
I have tried and failed to find a replacement fan (even in Chinese e-retailing sites), and after inquiring with a Xiaomi representative, it appears that Xiaomi does not allow notebook parts to be sold individually. This means that any potential issues MUST be resolved by sending the laptop back to China, which is a pain in the ass for someone living outside China like you and I.
The lack of ability to be repaired is really problematic, so I would caution against buying this laptop. The Lenovo ideapad 710s Pro, or 小新air13Pro features almost identical specs but with an older 940mx, at a similar price. If given another choice, I would probably buy that model, or hold out until the mx150 version of the same laptop is released. I have checked and it is much easier to find replacement parts (albeit in China, which requires shipping).