I've been seeing a lot of posts about motion issues. I have become pretty disillusioned with this aspect as well. While it keeps getting said that you get used to LCD motion over time, for me it's been the opposite. Coming from plasma, I thought motion was ok at first, but over time the Sony's performance has bugged me more and more. Even going back and forth comparing same content with my plasma (since moved to another room) as well as my 14yo Sony LCD, it's a night and day difference in most content. Sometimes the Sony's motion will ok, but often times it's as if it's only showing like 15fps and is a stuttering mess. No combination of motion settings does anything to mitigate it except for cranking SOE way up high, and even then it's still not buttery smooth like a lot of stuff should be at that level of SOE. Also seems to be just as many people praising how good motion is on these, so it really makes me think something is up, and that people who say motion is fine are likely right, as well people who say it's bad are also likely right. Something not consistent set to set.
Anyhow, warranty is just about up on mine, and recently came across a mainboard + tcon from a new broken (cracked screen) set for about $50, so picked that up to do a little experiment. If there is any real issue, I don't imagine an issue with the panel itself would be causing it. When I receive the parts, I'm going to swap 1 board at a time and see what happens. It'll be interesting to see if the performance changes at all. It would be nice if it did, and for the better, but I'm pretty much expecting the exact same performance. None the less, seems like a worthwhile experiment since I should be able to flip those parts on ebay and get what I put in back if nothing changes. Stay tuned.