I've ordered a number of times from GearBest. They're a lot like fasttech. Everything is authentic (unless specifically listed as "Styled" or "Clone").
Like FT...orders take 1-3 weeks to get here...and their tracking notices are often worthless.
For me (since every order has been received) I just put in the order => go back to living my life => when I find it in my mailbox...I know it's arrived...