I own a Xiaomi Note 4. It's a fantastic device for the price and has given me no trouble at all. Xiaomi's Android skin (MiUI) is nicely designed, performs well and is regularly updated even on older devices. Xiaomi aren't well known in the west, but they're the fifth largest mobile phone manufacturer in the world.

Depending on your country, you may have to pay import charges if you buy direct from China or Hong Kong. Even with import charges, Xiaomi phones still usually work out to be a good deal. Warranty coverage is limited if you're outside of Xiaomi's core markets, but parts are cheap and readily available if you need to replace a cracked screen or a weak battery.

I wouldn't recommend other Chinese brands like Doogee, Leagoo or UMI. The hardware is usually good, but the software is often poor and you can forget about updates.