I wish I could find a review that addressed some details....
1. How does it handle push / pull ? .... not enuff fan connectors.
2. Aside from the "fill GPU" question how about adding any component ? Drain QD should be at lowest point in the loop, fill point the highest. You wouldn't prefill the GPU, simply tie it in. Then you go to the top fill port (silver thingie in top pic) and fill the loop from there.
3. Problem is, as I see it, that filling and bleeding from same port is cumbersome. The way I would approach filling the loop after adding any component would be to:
a) Take off fill plug
b) Add a G/14 Bitspower C-47 fitting which would transition from the screw threads to a 10mm acylic tube about 12" long.
c) Use a squeeze bottle or funnel to fill tube
d) Run pump using 12V DC power source in short bursts to allow water to drop in and air to get out thru tube. Cost is about $5 for parts not counting DC power source.
This is what I use for DC power for bleeding and leak testing water loops w/o risk of water damage to components.
http://www.frozencpu.com/products/9106/bus-192/AC_to_DC_Adapter_-_110V_AC_to_12V_DC_Converter_w_Standard_4_Pin_5000mA_Max.html
I routinely use this method on each WC build whether custom loop or Swiftech H-220-X / 240-X series. It works quite well on the Swiftech because of the provided reservoir and Window.
4. Video has fans installed backwards (exhaust) greatly reducing effectiveness of cooling using preheated interior case air for cooling and, in many cases, setting up negative case pressure (unless ya have 5 or more intake fans) which will suck in dust and PSU exhaust heat in thru rear slot grilles.
With 2 ports (fill / bleed), a reservoir window and 6 fan ports, it would be much more attractive.