Hey, I'm a new owner of an LG46LW5600 I picked up from Best Buy. I've had it for about 10 days now.
I was tired of watching my favorite tv shows on a little 22" pc monitor so I splurged on a big screen TV . I decided to go with this after looking at CNET's review.
First thing I noticed when I turned on this TV was vertical bands when there was a solid picture. They become obvious on scenes that pan. They arent very obvious when watching normal content.

The other thing I noticed was the HUGE input lag with my PC connected via HDMI.. (heavy mouse, lips out of sync) Game Mode helps a bit, but its still laggy.. I have tested a few games, they are playable but the lag is perceivable.
I have to say watching movies in 3D is great with NVIDIA 3DTV play and stereoscopic player. I had a group of 6 people watching 3D at the same time with this TV and have had no shortage of 3D content these days. That was one of the great things about this HDTV, no expensive 3D glasses to buy but resolution suffers and it is obvious...
I have prior 3D experience with NVIDIA 3D vision glasses on an ASUS VG236H and you can notice loss in resolution if coming from active glasses but the picture is much brighter with the passive glasses. You'll want to only use 3D resolution setting ONLY when viewing 3D content otherwise normal 2D content will look blurry.
I'm thinking to return this set next week for a the Panasonic TC-P50ST30 based on what I've read about its low input lag and screen uniformity and good 3D.
I will miss the passive 3D but I really want something that will have better image quality and less artifacts, especially like when there is a sky scene that is panning.
Maybe I just got a a bad luck in the LG panel lottery? Its a great TV if you don't obsess over things like I tend to do. Either way the input lag and vertical bands make me want to return this set.