I guess the spinny buffer wheels save some elbow grease, but you can accomplish the same thing with some appropriate cleaning fluid (Windex?) and a soft linen towel, or non-scratch lens cleaning cloths from an optician shop. Bad scratches and dings can sometimes be ground out with toothpaste and a Q-tip, followed by some fine abrasive plastic polish, followed by Armor-All. Just lightly scratched discs that skip can be made playable again just with Armor-All and a good buffing. (It does not harm the polycarbonate -- I have some CDs I treated with Armor-All 20 years ago, and they still play fine).