Bought one of these myself to try, though it had a different brand name - looked extremely similar though. Opinion - load of rubbish. Don’t dare use the ‘harsh procedure’ as it completely wrote off 2 discs for me. On the otherhand the ‘mild polish’ makes the discs nice and shiny but leaves them with visible circular marks where the polishing heads have been - and it didn’t help playability. Product is available in the UK from Macro and Maplins for Â£20-Â£30 for the kit. I think the ‘Skip Doctor’ product is likely to be much better, though not used one myself.