Just bought the 70" 845U Sharp yesterday. Plugged it in and no real problems. I do see some of the things that others have posted - soap opera affect, occasional "halo" effect, but don't know enough yet to start fixing - no real "clouding" effects. Overall, for under $3K, a decent buy.
The one thing I can't get to work is the internet connection. I had to do the manual setting. The TV found the signal and I Input the WEP security key, but when running the "Connection Test" it always fails. There were 2 bars from a signal strength perspective. The TV is about 20 feet from my router. Any thoughts?