I just picked a 55" up yesterday at Costco with the Samsung pane, TH01.
I replaced out 55" GT30 in our bedroom with it. We wanted to get rid of clutter, Dune HD Box, Apple TV, etc and go with a smart TV.
PQ was not my main concern, its a bedroom TV and most of the content we watch is streamed anyways but I did not expect such a dramatic drop.
Hard to go from the very natural and smooth plasma to LED. I played around with the sittings and got it to be more watchable.
The netflix client compared to the Apple TV is not nearly as good PQ wise nor the interface. The Apple TV shifts resolutions based on connection on the fly, the Samsung app stops, buffers, and goes. It takes forever to buffer and I have a 100mbps connection at home.
We have a lot of content in MP4 and seemed to be no list view in the DLNA client, only those big tiles which makes it difficult to sort/find. Plex was quite a bit better but again the PQ just did not seem as good as the Dune HD.
This is not a TV PQ issue. DirecTV looked fine. Netflix via the Apple TV was superior compared to the built in client, any of our content via the Dune HD was superior compared to the built in smart apps.
Looks nice on the wall and it was 1/2 the weight of the plasma.
We really wanted to eliminate all the clutter under the TV but does not seem like that is going to work. Probably going to take it back this week.