The downside of the movie, at least to anyone that has some kind of moral standard, is the general sleaziness of all the characters, including the policeman played by a pre-NYPD Dennis Franz (who has hair here!). Director-writer Brian de Palma does a super Hitchcock-imitation (many called it a 'ripoff') with this film and the 2.35:1 widescreen DVD is a must to fully appreciate the camera-work (and several scenes with people hiding on each side which are lost on formatted-for-TV tapes).
A great suspense movie with terrific slow camera-work adding to the dramatics makes this a treat to watch and enjoy.