Atmospheric. Great production value. Both creepy and conceptual. Love how they pull the rug out from under you -- again, and again. The creepy Für Elise rendition, especially how it degrades to a single repeated note, is very effective.
My kinda movie. Have heard mixed reviews. Hope this one comes through. With Daniel Craig, Naomi Watts, and Rachel Weisz executing those plot twists, could be good.
But, plot twists cut both ways -- can be too conceptual for some, may not draw a huge audience. If they work though, if word of mouth is good, could do well. Needs good buzz, though. Tons of marketing won't be enough, not with this kind of story.