Iv'e had my KDL-55ex710 as a replacement for my KDS-55A2000 for a week now and I am pretty satisfied with it so far, especially for the price I paid.
I play a lot of games and had been playing Twilight Princess on the Wii before the new set arrived. I always thought the A2000 gave gaming this slight out of focus cloudiness and after playing through the game for a week on the new set it is so much better. Blacks look pretty damn deep to me. All that "cloudiness" is gone and the games look sharper then ever. I also fired up Metroid Corruption as well as MGS4 on my PS3, WOW!
Watched Avatar on Blu-Ray with the PS3 over the weekend and even my wife crapped her pants at the amazing PC. Even the Netflix streaming directly on the set looks great as long as it is a good 1080p signal and here is where I will voice my only real complaint.
If the signal is not very good the image looks like **** compared to that of the A2000. I am guessing the upconversion blows on the new set. It amazes me how many shows we watch that aren't as crisp and clear as others. Sometimes the commercials look astounding but then the main program material looks like crap. I'm sure my RCN cable is to blame at times. I've also noticed some channels are better than others. Haven't played a DVD yet but my player has its own upconverter so I'm sure it will look ok.
The only other thing I could say that might be negative is that if you have motion blur on standard is seems ok but if it is on none I feel like my eyes are getting strained. It could be an artifact of LCD's at the 55" range which is why the motion blur setting helps. It took me a couple of days to figure this out. Since I have kept the setting on standard I haven't felt like my eyes are struggling and straining anymore. Another factor is that the new set sits a whole foot further back than the A2000 so that could be messing with my eyes as well.
Over all though this set rocks. The form factor alone makes my living room look so much larger and we haven't even upgraded our tv stand yet. As long as the program material is high quality the set will make it sing. It's kinda hard for me to see what better a pc you can get with a $3000+ set. Hey, maybe this new set will start going bad in 5 years and sony gets sued again and offers another replacement program. I could get used to that
I don't have the heart to throw away or even sell my old A2000. I might just give it away to someone who could use it since it is still ok for gaming, at least for a couple more years anyway. Maybe I will trade it for some super good beer or something. I wish I lived in a large place where I could put it in another room but alas I don't.