Have you ever loaded up a game that you haven't played for a while and been faced with a 2gb download? Yeah, that sucks. Anyway, in the past you've had to sit and watch the download % - you were unable to play anything. Not anymore though.
Microsoft confirmed along with the Xbox One that consumers would be able to play disc-based games while installing them on the hardrive, and recently confirmed the same functionality with downloadable content.
The Xbox One is really starting to shape up with some useful functionality, so, PS4 or XBONE?