They are of good quality and they are only $35 - so you could always order one and do some testing. The support from Parallel Miner is pretty amazing. Check out the discussions tab - I have worked with Joseph in the past. He is very responsive and will generally respond via an email or phone call within a few hours of your request.
Here is a video of one of the PSUs in action -
https://www.youtube.com/edit?o=U&video_id=Dq0CyIQWDrkThanks. Will check
I am also checking Chinese Factories too, as eventually everything comes from there... So prices will be cheap.. If you are planing to buy 50 or 100 Pieces...