I backed this Kickstarter and got their SNES component cables out of it; I followed their progress through the e-mails they regularly sent out and it looks like they did their homework and know their stuff. The SNES component cables I received worked perfectly. I had previously modded my SNES to output RGB by simply soldering wires from the PPU to female RCA connections I mounter to the side of my SNES; this worked fine when I tweaked my video settings to get the color saturation to my liking. When I got the HD Retrovision cables, I made only minor adjustments (I reduced color saturation and increased sharpness) in comparison to my mod to get the output to my liking; in short, these are good cables.
These cables are legit, I run my SNES through my Onkyo receiver because the receiver scales low-res stuff better than my Sharp TV; the SNES looks great with these cables running through the Onkyo.
These cables offer an alternative to modding your console; yes, you could mod an SNES, Genesis, or NEO-GEO to output a component video signal, but these cables take what is already available at the A/V output port, usually RGB, and then incorporate the necessary electronic components to make that RGB signal compatible with a component signal which will play nice with televisions.
They offer an SNES cable, Genesis cable (you MegaDrive gits already have your SCART!), and then a NEO-GEO adapter that goes on the Genesis cable. I like this stuff.