I have the 811 with the DVI cable going out to my Hitachi 57SWX20B, and everything looks great. I didn't make any setting changes, but I also didn't have anything hooked up to Video 1 until I received the 811.
I have made the corrections to the color, brightness, etc. by using AVIA when I first got the in May. As with most other brands of TV's, there is a little bit of a Red push with this set, so it has to be turned down a bit.
For comparison, I have a Foxconn brand of DVI cable, 4 meter, dual-link, and got it off of Ebay for $9. Beats the $200 price tag for a 4 meter Monster set at the local stores!
Somewhere on this forum it was mentioned or linked to a document that the quality of the cable doesn't matter as long as it is under 15 feet long.