the Samsung ln-t5271f looks incredible with the 120hz turned on. somegames you cannot tell that much, but saints row, gears of war, gta, etc.. all look INCREDIBLE.
It makes saints row look like a pixar film, and it makes gears of war look like little plastic toys! But, the samsung also creates the trible ball effect sometimes, where you get the rough pixelation around the moving character. but for me it was only noticable if you were looking for it. also the samsung does not have 1:1 pixel mapping, so the xbox 360 picture is zoomed just a bit, you lose about 3% of the screen around the edges.
I tried the Sony KDL-52xbr4 next, because it does have 1:1 pixel mapping.
When you turn on the moitionflow 120hz feature, you cannot really see any difference.
none at all actually, but there is no triple ball effect, or pixelation, I also had a newer set, 2/25/08. the picture was excellent though, about as good as it gets. there was also not much of a difference on movies on that set with the 120hz on.
But in the end, I am going to take the sony back, and exchange it for the samsung again. I cant live with out that 120hz look of the games! It was as close to looking through a window as i have seen!