I was psyched to fix the disks that made my stereo want to cry as they played one note over and over like a song at a bad rave.You have to spend too much time on each disk if you want to fix your whole collection, or even part of it in one sitting. I made it through 10 disks before giving up (and my hands getting sore) the first night.The product essentially works like this: it comes with a tiny spray bottle, and you crank the handle as the disc turns VERY SLOWLY, and the wheel inside that is lined with a cloth smoothes the spray into the scratches.Effectiveness: It didn't fix my most-played discs, the ones with deeper scratches, but it did HELP with the rest (not good-as-new quality). I have had just as much luck with toothpaste and hairspray. Seriously.Overall I would say it isn't worth the money, time or effort, and it made my hands too sore too quickly.