I saw it too and even have it on DVD. It is a rather older film and it is good shedding some light on this type of disorder. The only problems I had with it were that it was extremely inaccurate regarding mental institutions here in the states for that time period. But that is Hollywood for ya...
However, if you want to see a really good movie that is a true story on mental illness try renting A Beautiful Mind with Russell Crowe. It is a great movie