I have no idea why so many rate this so poorly, I enjoyed it on video when it lacked the satanic orgy, and love it even more now. The support acting may be lacklustre but Carla Gravina more than compensates in a towering performance as the wheelchair bound possessed one. And what possession, no half hearted measures here - full tilt, in your face, on your chin, verbal and physical, screaming and spewing, hard hitting stuff. It is true the film is a bit slow at first but there is the magnificent and horrifying opening scenes that take some recovering from. It has of course to be acknowledged that this would never have been made were it not for The Exorcist but let that take nothing from this super exploitation gem.