I use Dropbox on my iPhone and it works great. I can see how that particular use-case doesn't benefit as much from the "just syncing local files" paradigm, but

I use Dropbox on my iPhone and it works great. I can see how that particular use-case doesn't benefit as much from the "just syncing local files" paradigm, but it certainly isn't a worse experience. In fact, these days Dropbox is my favored mechanism for transferring files to and from my phone. The auto-sync on the desktop side is much easier than going through a website.