I got a Scart RGB cable but may have a problem. Sometimes the picture jumps, it will stay fine and then maybe 20 seconds later jump a little or roll. I know about how the Atari ST syncs on green of RGB, some TVs don't like the signal or don't sync on green ect. Tried it on my LG LCD TV and my old Scart RGB CRT monitor from around that era there is also a green option on that monitor. Going to try it on a different modern CRT TV tomorrow and a smaller LCD TV. Most likely its something wrong with the cable but i don't see any problems; It looks all soldered up well with no touching bare wire, clean solder ect. RF cable looked surprisingly decent on the Atari STe just a bit more fuzzy but the colour was fine.
I know i had a bit of a rant but i might have to return that one so i'm still looking for offers.