I have always been leery of AliExpress and BangGood, never shopped with either of them. They just seem ripe with scam-ability. I'm not even particularly thrilled by Etsy. It just seems like the potential savings are not worth the headache, if there is a problem.
I have purchased a few 3D printed things from ToolCurve and they worked out ok, but I didn't see much of an alternative? Some day I would like to get a printer of my own, but I'm too busy for something new right now.
So many of the recognized brand goods are made in China, that it's somewhat hard to avoid, but somehow it feels like the potential to get scammed is lower if you stay away from buying direct.