I have this set (47) for few days now so I want to post some comments and maybe help others: To connect to PC you should use HDMI3 and label it PC to lower input lag, you wont be able to use most of the picture adjustments, but those are redundant and can be set on the computer. At least my TV with factory firmware uses chroma subsampling 4 2 2 not PC chroma 4 4 4, therefore text is not as sharp as it should be, hope they fix it soon.
DTS audio is not supported by TV player, so anything using DTS can't be played directly from USB.
There are other codec/playability issues, but this one sticks out.
My TV came with energy saving on and picture was horrible, it took me a while to figure that you can't turn it off from menu, you need to press energy button on the remote to change it to off.
In normal TV mode, this set has 100-130 ms video processing delay, if you're using external sound system, depending on your wiring you may have to compensate with audio delay to sync video and audio.
In general I like this TV, even if I'm still trying to find the right settings and workarounds, but the biggest bummer for me is chroma subsampling in PC mode. Without any internet capability neither on TV nor BR player, it's almost mandatory to hook it up to computer, but it doesn't look as good as it should. Why would they cut color info in half before displaying.