I don't think I like the part where it mocks up your UI to look like your files have synced, but they're not actually sitting on your drive.

I've been burned enough times by "Delayed Write", where you stick a bunch of files on a USB drive, pull it out and hop in the car, while back on your machine it pops up a little box saying "Whoa! hold up! we didn't actually copy any of those files yet, even though we said we had." This seems like another version of that same idea, except this time designed to leave me without any of the music and video I'd "synced" onto my new road machine right before hopping that month-long riverboat down the Congo.

Given a choice, I think I'd prefer that my machine actually did the things with my files that I've told it to do. Copy them when I copy them, sync them when I sync them. I hope there's an option to do that here.