Loved the Ending...
Just caught this on HBO. This is a great 70's era movie - a bit dated in parts but reliant more on the twisting plot and great ensemble cast of actors to create the suspense rather than modern FX, hip dialogue, or blood and gore. I thought the shock ending really made the movie. I think most of the criticism of the end stems from the fact that (SPOILERS)in the end Jacqueline proves to be as vindictive and ambitious as everyone else in the movie. She realizes that the only way to keep Jergens/Perkins from being together is to play their game - her only alternative is to be killed herself. This "shocker" ending leaves everyone compromised - like you would expect of anyone making a bargain with with devil. I think some folks are disappointed that there was no revenge and no real winners at the end but I think they are missing the point of the movie.
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I would recommend this to any fan of 70s era movies and a must see for horror buffs.