As noted above, SXRD, is a different form of LCD. It is a reflective LCD vs. a transmissive LCD. Reflective LCD (Sony SXRD or LCOS, the term used by other manufacturers) respond much faster than transmissive LCDs so they do not have problems with blurred motion. Also, they do a much better job at blocking light so they have deeper blacks, better contrast, and less murky pictures in dark scenes.
The Sony sets have been hailed by a lot of reviewers as the best RPTV sets ever made.
I own the Qualia version of the Sony set. Aside from a few minor features, a bigger screen and more powerful bulb, I really don't think there is ANY advantage of the Qualia set over the regular Sony models. It really would have paid to wait since the Qualia costs $13,000.
Picture quality is quite good with the SXRD. My only real issue is what is termed false contouring (blotchy, course, transitions between different shades at low light levels), but I see this with all kinds of sets, so I think it is more of a problem with low bit rates of information from my crappy cable provider. It's just more noticeable on a really big screen (mine is 70") that is extremely detailed.