Chinese rear differential

Has anybody one here actually bought and installed one of the Chinese “remanufactured” rear differentials that are all over Ebay and, if you have, what’s your experience of it? The prices seem too good to be true, considering it includes the full Haldex unit and I’m wondering what sort of quality they actually are. I know some OEM versions were actually built in a Chinese plant but it’s hard to believe this may be the source of them. All of the ads claim they have sold some but I’ve yet to find actual feedback from one of those sales.

Thanks.