I used Aliexpress/Alibaba to order a bunch of stuff when I was in Europe, and more recently to order a DRO for my mill to my house in the US. I've been happy with the level of service during the sale, and have not had to fix anything after the sale. DRO made it to me from China in 4 days, good shipping price (lots of voodoo economics goes into that, but similar in cost to US domestic shipping). The drawback for me has been the customs office, when applicable. Nothing from customs in the US, but it was a bigger factor than I expected in Europe. Everything is above board, just the fact that I had to pay taxes that I didn't budget for. That has nothing to do with Alibaba. They've earned my trust.