They sell a lot of knock-off merch (obviously) however stuff like cables, headphones, etc have always worked for me. I have gotten a ton of iPhone cables/chargers and out of like 20, only one didn't work. I didn't bother to return it because it each charger was less than $1.
Considering that their shipping is pretty much always free, and that the company is located in Hong Kong, the long shipping isn't that unreasonable. Whenever I order from them I general get my packages in 2-3 weeks. If you really want to, you can pay for faster shipping and get whatever you order in a week or so.