What I do recommend are modded server PSUs from established sellers like YTC. I have one of those myself and tested it.
this is very similar to what i'm saying.
i admitted that i never tested these units myself. i believe they should be tested.
what i've said over & over & over again, is that taobao has buyer protection from credit cards, and/or paypal. my recommendation is to buy something you think is a good value for the price, then test it; and if it isn't good, use buyer protection to get a refund.