Just letting you know, it's available on steam as well.
Just played through the demo there, and well, it's all i hoped it would be. Creepy, but not creepy enough to make the game "hard" to play. The difficulty is hard to gauge, as it wouldn't let me play on the hard mode, i found medium slightly challenging, which is a good sign.
The graphics are, well, probably the best i've seen on my pc. The first scene in the water blew me away.
The music fits perfectly, the lighthouse especially reminding me of Fallout 1's intro, atmospherically speaking.
While i was limited, i still got a good idea of the world's interactivity. There seems to be a good focus on manipulating situations, and so thats what i did. My favorite instance of this being when i entered a bathroom, and was fired upon by a make shift turret on what appeared to be an office chair. I stunned it with a plasmid, hacked it into my way of thinking (fun mini game, by the way, if a little easy), and lured enemies into it's path of destruction. I then did the same to two security bots, and in no time i had formed a little raiding party, me and my two flying machine guns, brilliant stuff.
The story seems interesting, the atmosphere is perfect, the big daddies intimidating, and the splicers a joy to fight ( due to their great variety, appearance, and mad ramblings, they range from scary, too disturbingly amusing - "This one looks like he's just had his cherry popped".
My only problem is the inventory system really, in short, you have to pick up everything (unless i was missing something), and can't just selectively loot, say, one item off a corpse. Stuff like food is immediately consumed, and so carrying things around is not an option. Not a problem really, as you can still carry a few med kits, and it wouldn't add much to the game anyway.
Overall, I'm extremely impressed by this demo, and it looks like i was right to pre order.