Certainly, the movie is worth the watch.
Insane or not Insane? That is the Question! What is the answer? (See my board post which answers that but contains spoilers there.) Well, you better take notes and watch carefully, because you might have to go back and re-watch a few scenes. Yeah, one of those nice suspense movies. :) The director here is in tune with the message, and will play with you using a tiny bit of Hitchcock like style, but it's a well crafted movie. Yes, there are some rough spots around the edges, but one should certainly watch it for the great story and pretty good acting by both the scientist and the women.
Break out the popcorn and watch the end closely! Good movie for the time period. Still fits for today. Nicely directed.