Ripped all my collection (1000+ CDs) into FLAC (storage and weekend listening), m4a variable rate with max quality (ipod) and mac lossless (music server). Must say that, in my opinion, sound is quite better than what you get from Itunes ripper (for both ma4 and lossless). It works extremely fast and does use all cores of the computer. Would only suggest to add the ability to change the tags after ripping and the possibility to direct different formats to different drives. Keep the good job!