I bought the 55" NX810 because I wanted something in between the HX909 and the LX900. The style at the end sold me. I customized my home theatre system and finally got everything running. I use a Sony STR-AD5400es for the main receiver and a PS3 for the BD player. I run all the components including the TV through a Monster HTS5100 Power regulator and use all high end HDMI cables. I also use the Logitech 900 remote which works very well. I require the rf ability as my HT system is hidden in another room. After 2 weeks of playing around with this TV Here are my conclusion:
Style is awesome. The NX810 all round form is very nice and really shows off the monolithic design. Everyone who comes over comments on the style of the TV
Performance- Overall solid. The depth is excellent. I previously had a 60" SXRD XBR and there is a clear difference. I have customized the three picture settings available (vivid, custom, standard) to my personal taste. What I have noticed is the TV is extremely bright. The NX810 really pops. I have the Live Colour setting set at low. If any higher the picture becomes too saturated. The motionflow creates a home video look to everything except when watching sports. For movies I have the motionflow set to Clear 1 which is the best IMO of the bunch. Clear 2 adds a black frame that darkens the image too much. I recommend also not to turn on the noise reduction as it increase edge enhancements. I have not really notice the LED Dynamic backlighting yet or maybe its really subtle. Overall I am very impressed with the over all depth and black level of the NX810. I have not notice any uniformity problems yet. I have been looking for this and haven't found any problems. No flashlighting problems as well. I'm not a pro just an avid movie and TV viewer.
I also find the internet option really cool. I have a dnla network in my place and find the NX810 very user friendly to set up and to utilize these options. Love the Slacker radio option especially.
I wanted the Opticontrast screen to decrease the amount of reflection and to increase contrast as my place has floor to ceiling bay windows. Unfortunatley the NX810 does have a significant reflection in bright environments. But I feel most TV would have this issue especially im my place.
Secondly the NX810 is a finger print magnet. Its nice to look at but you better use gloves or micro fibre towels to handle or finger prints will be a huge issue.
Third if you are not watching HD then the NX810 image is very average in 480p or 720p. I find it hard to believe that Sony can't improve the image quality for lower resolution broadcasts
Fourth if you do not have a good HT system then the audio of the NX810 is medicocre. If you are willing to spend the coin on the NX810 you should be willing to lay some coin down for a decent HT system.
Overall a 8/10
I also bought a 32" EX710 and the HCT150 soundbar for my bedroom. Very nice but thats a different thread
Hope this helps. I will provide my picture settings for each later