I do think it is great to have it but personally i don't use demos, the reason being is a few times i have played the demo for a game and not liked it (for example dragons dogma) so i chose not to purchase the game, then a year or so down the line i saw dragons dogma: dark arisen on sale very cheap so i decided what the hell i'm buying it, it then turns out to be an awesome game and because of that demo i almost never got to play it.