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I don't know if they include a wiring diagram, and how their price compared to Monoprice's, that does include the wiring diagram that looks correct based on Hypex's recommendation. I have used Monoprice's and know they worked well, i.e. no audible ground loop hum, no hiss either.
There was a run of bad ones at one time it seems, based on a wide survey of owners over a couple of years. I believe they are good to be used again for a while now.
This. Per Monoprice website they still have pin 1 of the XLR connected to sleeve via pin 3, which is not the recommended Hypex configuration. All explained in the Hypex Legacy Pin 1 problem document referenced several times in this thread.