Excellent unit of the highest quality. I can't believe how quick it can fix my disc's which are mainly DVD's. On first using I set the timer for two minutes I soon found this was not required as it seems to only require 10 or 20 seconds. (Very pleased with this purchase) I might add my discs have only slight imperfections. However loaned local library discs can be quite badly scratched. And for the sake of maybe 20 seconds, I've fixed them for the library.