I own Xiaomi laptop you mention for almost a year now (2016 model). It is overall a pretty fantastical laptop, especially for the price. But be aware, that some models (mine as well) have coil whine issue (1), so it may not be completely silent. Also, BIOS is very limited, you can disable security boot, choose boot device and that's pretty much it. However, Linux runs perfectly without jumping through any hoops.
Yes, by BIOS I mean the hardware setup utility you invoke before booting OS. It is very barebones compared to what ASUS offers in their laptops. There are no advanced settings such as configuring CPU features, timings, etc. It doesn't really bother me, since I don't tend to tinker with those settings. But I dislike the trend of locking down hardware.
The term is "tainted".