Since my previous posts above from November (also as #6 and 7 at
http://1n73r.net/2006/04/21/x2vga2-review/), I have discovered that of the following 3 problems I mentioned,
1) light-red horizontal bands that appear often. seems like it is either a poor conversion or noisy
2) all colors are washed out and greenish
3) every few minutes it sends a black screen to the LCD or the LCD turns the signal off for a moment lasting about 1 second.
I have resolved #1 and #2; they were due only to a bad component video cable (the Pr of YPbPr was broken) and not the fault of the x2vga2. I found this out by one day deciding to use a multimeter on the Wii-component cable to check whether all the pins actually connected to the RCA component plugs. So once I fixed the component cable, the colors are great and the banding is gone and 480p Wii looks pretty good on my Samsung 226BW LCD monitor. In fact, the x2vga2 does a better quality conversion than a similar product, the KWorld TVBox 1680ex, which I bought after being frustrated.
However, problem #3 persists -- the black screen every once in a while for a second, which has also been reported by others and sort of recognized by the manufacturer as a problem for which they would replace that person's x2vga2 with a new version (see comment #3 at
http://1n73r.net/2006/04/21/x2vga2-review/). I am still awaiting to hear from them regarding this.