hm, for my laptop with integrated graphics chip none of the versions give me an actual fullscreen game, just the same game window with the blackened rest of the screen.
not that it bothers me, I like playing windowed games most.
also I really dislike when there are no demos available for games, for example on steam, because with my shitty graphics setup I háve to check if it turns out even playable. and if it doesn't I'm
and want a new laptop.
anyways, that's my point of view on demos, I check if the game would be playable, and of course also try to see if the game style etc seems likeable enough to me. but yeah, that discussion is quite concluded now, I think.