I liked both of these movies alot and I recommend them for everyone. They have a similar atmosphere as "Seven", wich also is one of my favourite movies. They have alot of twists and turns in the plot wich keeps you guessing all the time and it leaves you with a distinc "what the fuck" feeling. I wouldn't say that it is a "scary" movie in the scence that it doesn't have alot of "bloody" scenes and such. It concetrates more on messing with your head, with sick situations and scenarios.
If anyone else has seen the movie it would be great to discuss it. I don't want to spoil it for anyone, so I won't say anymore for now.