The problem with most chinese brands (Xiaomi, Mijue, etc.) is the non-existing software updates.
[edit] It also still holds a 2-day charge after all this time and for it's price (180 euro's) it has been my best phone purchase in years.
I have had samsungs and motorolas, and updates were few and slow.
The real problem with phones made for China is that they don't support LTE bands from North America.
That's bad because I would love to have such a nice phone, but not at the expense of going back to 3G.