I was looking at that one previously Gustov and from what I can tell it's good value for money indeed. AVForums review gave it an Excellent score, not because it's the best panel ever, but because you get a lot for your money.
However I recently got a LE40B650 unit and the backlighting was poor on it, plus the panel itself seemed to lag when connected to the PC, video movement was fine but I definitely noticed some input lag, which is odd as my 3 year old Samsung LE26R74 doesn't seem to have the same issues.
Due to these issues I had to send it back. Mostly for the backlighting problem but also because I have it plugged into an HTPC and input lag is very annoying when you move the mouse on the screen, it seems to lag behind by about 0.5 seconds. This is all of course of the newer 6 series B650 but it may be you see the same input lag issue with the older model?