I guess I'll be the first to chime in on this T.V.
Bought the 55UX600U about 2 week ago and I must say that I'm pretty impressed. I currently also own a Samsung PN50B650 plasma which is known for having an outstanding picture. So right off the bat, this T.V. had a lot to live up to.
At first I was a tad sceptical at the idea of buying anything other than plasma (I love the inky blacks and great contrast ratio.), but we needed a new T.V. for our remodeled den which has a few windows in it, so I really wanted something that was a bit brighter than my plasma and that could handle some outside light.
I'm quite picky when it comes to video quality, and I have to say that the Toshiba rivals my Samsung plasma. In a side by side comparison, blacks were fairly identical if not just about the same. Lots of detail in the dark, shaded areas of many of my Blu-rays. However, this was really only when viewing both sets in a lit room. In a darkened room, I think the Samsung had a bit deeper blacks, but not by much.
The Toshiba, for sure, has much more "POP" than the plasma. It just seems to me that the "3D" effect and detail in the picture is much better on the Toshiba LED. My friend, who owns the 58" version of Samsungs plasma, even commented on how much more detail and "POP" the Toshiba had over the Samsung. (Especially with Blu-ray)
Once I calibrated the Toshiba, colors are accurate and right on par with my Samsung. (Once again, the Toshibas colors just seemed to "POP" a bit more without being oversaturated.)
The one thing that the Samsung has over the Toshiba is the viewing angle. If you go about 60 degrees off axis from the center of the T.V. colors get pretty washed out. This isn't an issue for me as we have one couch that sits directly in front (center) of the T.V. But, for those who might have company over to watch a movie and have couches or recliners that sit off axis from the T.V. than LED might not be for you. This is obviously a non issue for plasmas.
All in all, I quite happy with my purchase. Got a great deal on Amazon. Won't be returning this set. The included USB Wi-Fi dongle was a nice included addition.
As a lover of plasma, this T.V. has won me over and convinced me that LED is closing the gap when it comes to pictue quality.