I found the story a bit contrived, but within the universe it set up it worked wonderfully. Maybe because of the expectation of something closer to Hitchcock it took me a while to get immersed into this universe.
What really stood out for me was Bergman. It was a perfect role for her, hovering on the verge of insanity, being fragile and demanding at the same time. Also Charles Boyer, slowly stepping up the coldness and ruthlessness of his husband act was extremely convincing. Joseph Cotten perfectly rounds out the cast and Angela Lansbury was hilarious to watch.