They swapped out my Mits 65831 today for the 70XBR2. All I can say is WOW. So much more detail, so much more clarity. The grass on the fields finally look life-like again. This is how HD is supposed to look!
I was really worried the bigger screen, plus deeper cabinet would be too close to my eyes - but the details and sharpness are still better than the Mits which is slightly smaller and sat further back.
I'm also REALLY impressed with the speakers. The sound is MUCH better than the Mits. Lots of deep bass rumbles, lots of punch, and decent surround effects. It really creates a perfect home theater experience. The Mits is really poor in regards to sound quality. I know I will eventually build back my theater audio for even better sound, but the included speakers are really nice for every day watching, games, and movies.
So far I am completely happy I swapped out!