My experience with GearBest has been 99.9% positive. The only little criticism I do have is, as with many other companies too, the call centre come service hotline. I don't know if it is language barriers or a lack of knowledge but sometimes the response to product related questions insn't exactly satisfying!
Having said that, everything else is just great! Almost always best prices, always great quality and any sales related query is dealt with in a swift and competent manner!
Delivery times are within the "normal" frame of intnl. Shipping and there are always a few options to speed up the process i. E. express delivery for an extra but reasonable fee.
I had some 20 deliveries with about 80 items shipped from GearBest and so far I didn't have to send anything back for a refund or exchange.
I do recommend GearBest as a reliable and trustworthy online store!