Hi!
A half year ago I tested a close relative of your monitor, Samsung 711MP. Basically, it's a 17" LCD TV. It has composite, S-video and SCART RGB alongside DVI VGA connector. TV-tuner part is really bad (not important in this story), but unfortunatelly same goes for AD converter. I took composite out from A520 and tried AMIGA RGB with standard RGB-SCART cable. Even with great difference in signal nature which is obvious in terms of color definition or bleeding, pixel discrimination and ghost shaddowing, I was more than dissapointed. Even with 15Khz RGB feed, the image had a lot of noise, geometry wasn't perfect since no image adjusting was available. Samsung was saving on AD sampler using some pre-2000 9-converter or worse.
A friend of mine told me that SM741MP could do better since Samsung remained strong in offering tuner box in this class of LCD's.