I tried a grandtec scan converter with component out on a sony vega or is it wega and the difference in quality is there but it is only slightly better than s-video. Without advancemame or arcadevga strait to RGB it will always end up a dissappointment to someone who is picky and wants something even close to RGB. If there was a way to get a direct conversion to component out without the darned dot crawl flicker thing that is always going on then it would be fine, however in my experience prepare for dissappointment unless you go RGB. It seems that all video card manufacturers are converting vga to component and here comes the flickery dot crawl thing.
I really get sick of s-video or component output myself, however if others are satisfied with whatever then for them that is all that matters. Personally, s-video almost gives me epilepsy and a headache. ATI and nvidea do the best they can at tv out but it is still very poor compared to strait RGB, which is rock solid dots that never seem to move or flicker. Anyway, I would be curious to see what ATI component looks like in hopes of a cheap convenient way to get a authentic or nearly authentic arcade display but I know better