I've had the 52xv545u for a few days now, and overall I'm pretty happy with it. It's good, but it's not perfect (but, then again, if you care enough to read AVS, no TV will be
To touch on a few of the points that have been mentioned here already:
Flashlighting / clouding / mura: Some pretty bad flashlighting in the top two corners (right is far worse than the left), and some clouding on the bottom left. Other than the top right, it really isn't too noticeable except during dark scenes / 4:3 content, especially if the room is dark. During brighter content, I don't notice any of it at all. Mostly just notice it if I'm looking for it.
SRT: Honestly, I'm surprised it does as good of job as it does. DVDs do look sharper and clearer, but so does MPEG compression artifacts. I prefer it on rather than off, but I've always had a preference towards sharper picture with artifacts over softer picture with no artifacts (why I use Nero Recode instead of CloneDVD for backing up DVDs... but that's completely unrelated :P) Keep in mind if you're using a PS3 or something for playing DVDs, set it to 480p otherwise SRT won't do anything.
ClearFrame (frame interpolation): Very little SOE. I do notice it slightly in credits and sometimes during a zoom, but overall it looks pretty natural. Substantially cuts down on motion blur. Smoothing option really doesn't seem to do anything, though...
Gaming: The main reason why I bought this TV
So far I've only tried out my gaming PC (with a 360 controller - UT3 and Assassin's Creed) and my PS3 (Ridge Racer 7, Burnout Paradise, Uncharted, demo of Mirror's Edge, and Hot Shots Golf Out of Bounds). There is a slight lag (I hooked up my PC monitor and ran a timecode - roughly 3 frame delay), but nothing that would seriously hurt gaming. Hot Shots Golf is the only one that really suffered, but gaming mode works for that (roughly 1 frame delay). Granted, the picture doesn't look nearly as nice (and no clearframe means more blur), but it gets the job done.
PQ: Looks good to me... compared to my crappy LCD monitor at least :P. My set looks like it has too much red in it, but I'm guessing I can fix that. Good viewing angles, blacks are good, can't say I really noticed the green push though. I did go through and set everything up with DVE. (One interesting note, I did notice in DVE that the set doesn't do a completely smooth grayscale transition - probably because of the 14-bit processor using a 10-bit panel. Other than in DVE's test, though, I've never noticed a problem)
Other than that, nothing else really pops into mind. Overall, I'd say it's a pretty good set - I'm thinking if anything I may be being overly critical of it. Any questions, feel free to ask