Lunatic

well i just saw this on best buy they had it running on some computers, and i wondered, does this take up less space to install in your computer than the normal xp proffesional that i got? cause i liked this, and i wondered how is it different than xp profesional. and i was reading a few things on it and i saw you can record shows off your satellite dish and im also interested in this, does anybody have this installed?