I assume you're talking about Samsung's new "Luxia" line models which currently include the B6000, B7000, and B8000? Although Samsung is marketing these models as "LED", they are NOT true LED's. What they do have are individual edge-lit LED's located around the perimeter of the panel (which then reflect off a mirror behind the panel to illuminate the screen), but there isn't any true backlight on these sets, which is why they can be so thin.
However, later this fall, Samsung will be releasing the B9000 which will be a real LED set with actual individual LED's dispersed directly behind the panel that will light the display. The B9000 will be the official replacement for their only current, true LED set.. the A950.
The B6000, B7000, and B8000 are Samsung's 1st generation edge-lit LED displays and the line is clearly a work in progress. They all suffer from many issues such as uneven panel, oversaturated colors, annoying corner flashlights, and terrible off-angle viewing. This is a result of the edge-lit technology, in which you sacrifice several key elements of picture quality for style. I highly recommend waiting until at least the 3rd generation if you're looking to invest in edge-lit technology. Sony was the first to bring it to market last year and theirs suffer from the same issues.
The B9000, however, will most likely be one of the best two sets on the market (going head-to-head with Sony's true LED XBR11), but you'll have to wait until the fall for both of those models.
The current best LED LCD sets on the market are Sony's XBR8 and Samsung's A950. Of course the Pioneer Elite Kuro is the way to go for plasma lovers.