The owned it for 3 weeks verdict:
LN40C630, panel code AA01.
Software version: T-VAL5AUSC-1002.1
Calibrated using the built-in patterns:
Sharpness 20 *
Dynamic Contrast off
Shadow detail 0
Color Space native
Flesh tone 0
Edge enhancement off
Digital Noise Filter low
MPEG noise filter low
Film Mode off
Auto Motion Plus 120 hz off
Primary source is DirecTV HD DVR (HR20-100) on HDMI
Secondary is OTA, but my antenna is not situated correctly just yet.
Overall, the panel is reasonably uniform in lighting. Contrast is very good and black levels are very good when looking directly on axis at the screen. Viewing angle good horizontally, with some shift of tint and black levels going left to right. Vertically changing viewing angles, the the black levels suffer greatly. The difference in directly at eye level at 10 feet versus standing up at 10 feet produces a significant loss in black levels off-axis. The blacks glow fairly brightly with a significant blue cast when off axis vertically. Fortunately, my stand puts the screen center exactly at eye level when sitting down.
As is typical of consumer TV's, the out of box settings are designed for eye-searing pop in the store. They're really awful and the edge enhancement and sharpening are over the top and the contrast seems to be aimed at a bipolar full-black or full blast setting. The "movie" setting is sort of ok, but I found it muddy and only suited for a very dark room. Dynamic - well, it makes all live sports look just like an XBox. I know people like it, but for me, this mode seems most suitable for warming a hot-dog should the microwave oven go on the fritz. It needs a little set up work to get a truly good picture. But it is capable of rendering a good image when setup properly. It does lack the subtlety that my previous 50" Panasonic plasma offered, even though it is several generations old now and only a 720p panel.
The ATSC tuner locks in on weak signals with the usual "all or nothing" aplomb. (gotta get the outdoor antenna up soon). The local CBS HD OTA looks great on this set. It lacks any kind of antenna signal meter at all, which is a PITA.
The built in "expert patterns" and RGB setup modes are really useful for quick calibrations. "Advanced" picture setting mode is only available in 2 of the four presets (standard and movie). Dynamic and Natural modes are partially pre-fixed.
I don't know how to enter the service menu, but I wouldn't mind tweaking those modes myself.
120hz motion flow is just too weird to leave on all the time. I did watch a hockey game with it on, and it looked great. However, it is distracting for movies and other normal content. So it is off.
My thoughts on this display is to mount it so your primary viewing is at eye level. The picture degrades considerably with vertical offset angles, even fairly small ones. On axis, it looks fantastic. This is not the set to mount over the fireplace or significantly out of the eye-level viewing plane.