Disagree. I can't stand Double Twist. I've got a media library of about 50 gb of music. Every single time I start Double Twist on my computer it scans my entire library of music and I have to wait for it to scan all of it before I can sync with my phone. I can configure it to not scan my media when I start up, but then if I add new albums, Double Twist never ever sees them until I start the scanning process and wait 30-45 mins while it scans all of my media from top to bottom. It's a real PITA. iTunes agent didn't work for me for whatever reason so I ended up going with TuneSync. It was ridiculously slow copying 20 GB of music over the air the first time, but after that it's worked very, very well for me. I can actually configure it (if I want) so I can sync with my home computer over 3G from anywhere in the world. I may set that up this weekend. That way I don't have to carry all my music around, but I still have it available to me.