I found this a bit disappointing considering its status as something of a cult classic, and given the fact that Donald Westlake wrote the screenplay, but there are two or three very good scenes that make it more than worthwhile. I particularly liked the ending - nothing too special or interesting, just a well-filmed thriller climax.
Terry O'Quinn is good, and I really liked Jill Schoelen as the teenage stepdaughter. There's also some cool 80s horror handheld camera stuff. But there are some pretty inexplicable plot points and some unintentionally silly moments that cheapen it for me.