I had seen the original and numbers 3 - 5 but never this one. After watching it last night, I was seriously revolted by it and understand now all the hate it got on its' first release when I was too young to see it.
At times, I felt that I was watching a porno film with the rape of Charles Bronson's housemaid and his daughter shockingly depicted: the deaths of the bad guys, especially the death by boom box were well deserved, it was nice to see Jill Ireland and Bronson was good as always, but the film was just too ugly for me.
A rare Michael Winner dud, IMO.