I was pleasantly surprised by this. Also, Tom Cruise was kind of sublime.
While the issue of clones has been addressed more effectively in films like Blade Runner and more recently, Moon, I don't think the masses can ever be told enough times, through whatever medium or narrative, that they shouldn't believe and accept everything they're told by those in positions of power.
And also, "Sally" was goddamned creepy. Especially at the end. So yes, fuck you, Sally.