Might want to read the fine print. The TV you use with those cables must accept 240P signal, otherwise you'll still need some sort of converter box to get a decent picture on the screen, or even an image at all, putting you back in the same boat as before where buying a scart cable and converter would be pretty much the same thing and is already available.
Of course it you're using a CRT with component inputs, this would be a good idea for something plug-and-play.