After using this product in trial mode, everything was messed up. I was hoping for identical copies of my iTunes library on my Mac, my iPod and my second Mac (which I use as a media player) . Instead I got duplicates and triplicates of music files on the second Mac, the library on my iPod was synched to the second Mac and refused to synch with the primary Mac. I had to do a full restore of the iPod and the iTunes library on the second Mac. Several hours lost.
Stay away from this program.