honestly, it's good value (at least in my country).
in term of build quality, there's some decent cheap ass generic gaming mechanical keyboard that cost around $20 - $50 in my country that using gaterons as the default switch.
those keyboards are aluminium plate mounted floating keys type keyboard. I can't even bend that s**t using my hand
in term of PCB quality, they're using cheap low quality PCB.
they're alright if you want to change the switch once or twice (if you want to use it as switch tester board then, buy hotswapable keyboard. they're as cheap as soldered one).
and for built-in features, there's not a lot of it. my first mechanical keyboard using Blue Gateron that cost me around $23 and got "anti-ghosting" mode that can be turn on or off, disable-able winkey (it's gaming keyboard so, i think its norm to have this feature

) and some horrendous RGB light show thingies that mimic what razer has.
i think that's all features that it has.
tl;dr :
its decent i guess. its tough enough, the default switch is good enough to type on, and off course they're cheap.
just be careful if you're going to buy from some chinese website that only say that its got blue switch but never mention it specifically (lest they give you some no brand switches).