ease of use if you already use itunes. I don't use it, but I assume it allows you move your playlists from itunes over to your droid. Takes the manual out of the equation. I actually pretty content with doubletwist. Do they even make a medialink for mac?
So what's the difference between this and just putting the SD Card into the computer?
The main thing I like about it is the fact I can copy all my iTunes music to it and the album art comes with it. Ne need to bring my iPod to work or the gym with me.