Just a side note; I only was able to test this with a single display. Haven't had big issues, only one time I had to re-jack the plug since the monitor didn't wake from sleep.
I found a solution for when you need to put your computer to sleep (when wake from sleep, no picture; have to re-jack mini displayport).
First; you need to use a smart power strip (They have a controlling outlet that you set the sensitivity for, so that the controlled outlets turn on when it detects the controlling outlet is drawing your preset power).
Second; Plug your computer into the controlling outlet.
Third; Plug your monitor into one of the controlled outlets.
Fourth; Plug an AC to USB DC power supply (I use a spare one that came with my old iPhone (No FLICKERING)) into a controlled outlet. (This step is optional to save you USB ports and to prevent flickering in cases where USB power from computer isn't high enough to power adapter).
Fifth; Plug your monoprice adapter's USB cable into a AC to USB DC PSU from the fourth step, or waste another USB port on your computer and possibly get flickering.
That is all. No more having to re-jack connectors. :rockout
I might be posting a 3x120Hz Monitor Eyefinity setup using three of these adapters with a 6990 + 6970 in the near future.