Received my 55ST60 this morning and I've been staring at this TV all day. My eyes need rest now. LOVE the picture quality improvement over a calibrated 55UT50. Home Theater setting is quite good out of the gate. I simply changed the contrast from 100 to 78. ST60 does not have that "soft" image UT50 has. It is definitely sharper all around. I am surprised how accurate the colors look with this pre-set setting. I can't wait to get this set properly calibrated. Out of the gate, skin tone is already quite accurate. It is fun trying to "break in" this TV by watching real content. I'll run the slides tonight when I sleep. I also tried CNET's settings in Cinema mode. It's nice, but I still prefer the Home Theater presets.
There is still buzzing, but less noticeable than the UT50. It is now a none-issue. Fingers crossed that the buzzing does not increase over time. I use an HTPC, and I definitely notice a slight lag when moving the mouse. I had similar experience with the UT50 so take my impression with a grain of salt. I don't think its any worse than the UT50. I don't game so I don't care about input lag.