First and foremost, do not buy this if you want something to tell the time.
The projection feature only works when the alarm sounds or when you hit the demo button on the body, it's not a constant. As such, you're left with a digital display smaller than most modern wrist watches, which is not backlit. In addition, and contrary to the misleading picture, even if you can get the dodgy projection focus right (at a distance of two feet at most), R2's head does not swivel, meaning he's left facing a wall. Hardly the optimum display angle.
The little bleeps are entertaining enough and the design is faithful, though there are better representations out there and the construction is unmistakably the lightest, cheapest plastic.
At £18 it's hard to recommend this. It's useless as a timepiece and only passable as a figurine. One for die-hard fans looking for novelty value only.