I don't know anyone that has seen this movie, but I enjoyed it. It is a nice take on blending a movie with an actors real world problems. By real world, I mean that real actors real life problems.
In this scene from JCVD.... JCVD breaks the fourth wall and probably does the best acting of his career. Given that what he talks about is real to him and his life (the kids, wives, drugs, etc), I'm not even sure if it was acting. Either way, it was very good. IIRC a lot of the film is in french, but it is really good. Hope some of you check it out.
Check out the trailer for a little more of the movie itself too.