I have the MiBand, and it drops hundreds of times. I had eventually lost it. Sure, it's only $10, but it doesn't make sense to buy anything just because it's cheap.
And I have the earbuds too. Sure another $10, but the sound is very mediocre compare to the stock headphones I got.
I also have one of their TVBox, bought it mainly for my Chinese parents. None of the channels work anymore oversea.
Sure, $10 who cares. But I would rather spend bit more on something that last longer than a manufacturer producing more electronic junk to this already-polluted planet.
I'm very happy with my Xiaomi piston earbuds, good sound quality, survived 1 year of use so far and only ~£10.
I've had one of their phones a few years ago and found it to work well. Just annoying that they'd skinned Android rather than providing stock.