I have to chime in here. I have a TWSBI, my latest Chinese pen, and it writes perfectly well. A friend gave me three Hero 616 models and two write well. The third is so-so but I think I can tinker with it to make it an acceptable writer.
My first pen purchase, after I got back into fountain pens last summer, was a Bookworm 675 for under $10. I've heard mixed reviews on this pen but mine was (right out of the box) and remains a perfectly wonderful pen. The finish hasn't peeled off as some have experienced and the pen has never skipped or had other problems with ink flow. It also writes incredibly smoothly as well.
Quality control is an issue anywhere, more so in countries that strive to provide products cheaply as they compete for their share of the global market. There has been much written about quality control (specifically in China) and it's really very interesting. Interesting also is the relationship between Chinese manufacturers and exporters and those who import these Chinese goods in the West. Often, the story is one-sided.
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