I haven't seen it yet myself. I wanted to, but it was gone from theatres before I got the chance.
I've heard confilicting reviews... it seems the movie's plot is rather convoluted, sometimes jumping around more than critics deem is necessary. But the general consensus from "real" people is that it's an outstanding film, one of the best of 2006. That if you didn't "get it", then you won't like it.