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Generally not a bad source for like general purpose - I bought a 1% metal film pack from a random far east Amazon seller out of curiosity and they seem like factory seconds - more like 3% accuracy over testing a dozen of them but otherwise don't seem to be a problem - no duds so far - so fine for little hobby projects, etc. but for audio use (or anything where you need good precision with small signals, etc.) I'd definitely buy from somewhere like Farnell.
tbh I by dud I was being more generic, in terms of away from spec/fake branded parts etc as well as just non-functional. If they're generally 3%, I'd have expected them to be marked as 5% and sold on normally, rather than being a factory second (unless something else is not to spec). For the majority of DIY uses though, a "not quite to spec" component will probably still be fine, but when you're looking more specific, then it becomes more important.