I bought the 55" version of this TV 8 months ago for $1,400 and it's been absolutely worth it. The basic picture is excellent, sharp and very bright. The screen has a matte finish which makes it good for bright rooms where there might be reflections off the screen.
The TV has a couple of built in speakers that do a perfectly adequate job if you're not too picky. Certainly not as good as a powered audio surround setup, but it works OK.
Lots of HDMI inputs, and it can play almost anything directly off a USB stick or USB hard drive. It can be a little persnickety about what sort of USB hard drive it likes though.
It has Internet connectivity either through WiFi or cable. I found the WiFi a little stuttery for streaming HD, so I did the CAT 5 cable. It's rock solid. It can access media collections on your network, although their version of the Plex server is buggy.
Its built in web browser is sorta sucktastic, but it is theoretically possible to surf the web with the thing. But you won't like it.
Although when I got it I didn't care about the 3D aspect, I eventually picked up a few 3D blurays (Hugo, Cars2, etc). It was a pretty WOW experience. A very nice 3D effect, and using passive glasses (These are inexpensive and additional pairs are available a lot of places). The TV also has the ability to covert regular 2D into 3D and does an OK job at it. But I think that's a bit of a gimmick.
The style of the TV is very slim and sleek looking. It's pretty lightweight too.
There is a link to a huge thread on the merits of this TV below. It's actually for a slightly different model with a few more features (LW5600), but they are almost identical. Later in the thread, there are hacking instructions to open up some of the additional, hidden features of this unit:
LW5600 on AVS forum
Anyway, it's a great TV, and if I didn't already have one, I'd fall all over this!