I had the HiPix connected to Comp1 on my G11 for a while before getting my 5 BNC breakout cable and connecting it to Comp2.
I posted here when making the switch (can't find the post now, though) and mentioned that I couldn't really tell a difference between the two...they both really looked fantastic!
In an A/B comparison switching back and forth, my fiance picked the Comp1 VGA input, and I picked the Comp2 BNC input (when she was switching for me). We both agreed that it was hard to tell which was better.
I was happy with both configurations!
(I say "was" as I am using an AccessDTV card currently).
Technical Director, Home Theater Products