Is there really that big of a difference between S-Video and RGB on SNES?

[Drixxel]

This is what I've been using as a video switcher for my systems on composite. It does composite as well as S-video. I haven't tried out the S-video to see how well it works. I was going to pick up another one of these since I've had to double up my systems on the one I have.

http://www.ebay.com/itm/Pelican-Vide...item4600e5e38c

I have a Hip Gear branded "System Selector" which looks remarkably similar only it has space for 5 inputs, composite & s-video. It's worked like a charm for years on an old Samsung CRT and, at least on the composite side, I've never noticed any negative effect on signal quality although, like Polygon, I haven't ran s-video through it. It was something like $10 from a local Blockbuster, found in one of those bins of random accessories.

Here's the one: http://www.estarland.com/DefaultPage.product.30696.html