Cheap Chinese parts = expensive branded parts without stickers
I don't doubt that some of the cheap Chinese stuff is good quality, but you don't have the comfort or knowing. You also don't have the warrantee protection/ease. There are obviously the usual counters to those points, but I still think it's a stretch to say they're the same.
I'm also inclined to agree with SF on the possibility that some people who've bought these parts might not be that honest about owning up when they have a dud.
You're an absolute gift to a marketing man, keep spending and encouraging others to do so :)