I had terrible results with 3 RGB-->Scart cables even after using 3 different schematics with my LCD/TV.
With my normal TV all scart worked like a charm...
As Amiboy say many LCD/TV's show like crap (distorting or showing scrolling lines.
ATM I'm using DJBase's S-VHS adapter for native resolutions that works like a charm. Quality like RKauer said is so much superb than the plain Composite!