Say what you like about 'em.
The Oneplus One is an absolute fucktonne of device for a ludicrously[1] low price. Still impossible to touch on price/performance to this day and very few outdo it on pure performance (and elsewhere you can count the number of year old, but still pack-leading, devices on the fingers of one foot).
Funny how an unlocked device of massively puissant spec needn't cost an arm and a leg once its manufacturer tells the networks to shove their subsidies and control where the sun shineth not. There's a lesson in there........
[1] Well, it was. Since they cut the prices hugely recently, I'm afraid that the English language is all out of superlatives.