First, if you are looking at this app and see all the 1 star reviews, it is because people did not read the directions. I am so impressed with this application that I fired up iTunes to rate it 5 stars and write my first review in iTunes.
I have been switching out thumb drives and formatting them to work on mac and windows today as I have been setting up my windows 7 machine. I wanted to transfer files EASILY from the mac to the windows machine and vise versa. I would never have guessed my little iPod would do it beyond my expectations.
Follow the "help" instructions in the app, it takes seconds to configure for mac or windows. If you do this, it is not confusing. I set my iPod up on my mac and windows machine in a couple of minutes. Now my iPod shows up as a network drive on my comnputers! I can drag files from the mac onto my iPod, preview them from the iPod, and my windows machine can access the files, and vice versa. It makes the iPod or iPhone a super fast, portable server. If you like thumb drives, and it would help to not have to plug it in to one computer and switch to another, get this app-- you can wirelessly connect several computers to the iPhone at once and swapping files is several times quicker than using a thumb drive.
--Sean (btw check out my song, "U4ia")