When I was having issues with my X800 players, I was able to get in touch with Sony's engineering department, who actually came out to visit me and check my setup (they actually drove over 10 hours each way). Six months later, they swapped the X800's out for X800M2's. I then asked them about the...
@Martin Dew I disagree with your inclusion of Sony's overpriced UBP-X1100ES, which with a few minor differences, is essentially the same as the more modestly priced UBP-X800M2 ($299.99 USD MSRP). Format specs are identical.