I would honestly say avoid this rubbish and avoid UPlay.
From Dust is repetitive, monotonous and boring. It might appeal to some people's OCD but there's no way you can play this for more than an hour at a time without needing a cup of coffee to keep you going and I don't even like coffee that much.
As for UPlay, Ubisoft lied. You need a serial to use it (DRM-free my ass). UPlay synchronises saves, account-locks the game and updates it. You know, like what Steam is supposed to do? Yeah, that, just worse, slower and with issues.
I can't believe I spent $15 on this, but I figured it would give me a chance to see what Ubisoft's DRM/UPlay is like and I can honestly say first and absolute last time.