@ancientone: That doesn't really say anything about Toseek or OG EVKIN as a brand. They often sell identical parts, just with a different brand slapped on it. I've used both, with mostly good results, but I'm using OG EVKIN less and less as they're trying to charge premium prices for parts that aren't even exclusive to them, and have the same QC issues you have with other AliExpress sellers.
If you don't consider other cyclist experiences and feedback, than basically it would definitely not say anything.
I only buy from "official shops". So if it has a "QC" issue, it's the brands responsibility. Again, those are my personal experiences, if you have different one, great for you.
Yes, I think OG-EVKIN is over priced but outside of buying from brand names like Specialized at 4 times their price which is even more overpriced , I feel comfortable with OG-EVKIN handlebar. I do regret getting their saddle. AND they do get pissy with customers if they get bad review, so that's definitely a negative.