Just found this thread. I purchased my 50X1 two weeks ago at Ultimate Electronics. They were having a big sale and I got a new one for $879.00 at the store.
I have tweaked the settings along the lines of what folks have here, and I have to tell you the output is fantastic. I originally was going to put this in my game room for my Xbox 360 and PS3, but decided to put in my main room for movies and such.
I know you could get a better picture with spending some more money, but this is a great set! This is replacing my little dink 26" HD LCD, so it is like moving up to IMAX
If anyone needs info let me know. I dont have access to the sophisticated test equipment, but I'll try to answer questions.