in reply to OP: "So, is this worth it for the video quality difference?"
only if you are using a crt, yes.
if you're using a hd/led/lcd/whatever new word for it this week, nope, cos the image will still be crap. (lego)
if you're using a hd/led/lcd/whatever new word for it this week, you would be better off investing in either a
xrgb-mini (framemeister) type device or buy a secondhand crt or stick to composite as it is excellent from the
pcengine consoles and save the cash.