This flick gets lots of my classic movie love. Any film featuring a chase scene across the faces on Mount Rushmore just can't be wrong.
I showed this to my 25 year old girlfriend a few months back. She enjoyed it, but kept asking "this is really Hitchcock?", having only been exposed to his more horror based work like Psycho. On re-watching it parts are rather slow for an action/thriller, but that's just comparison to modern cinema. Some of the twists and turns are probably a bit predictable with a modern filmgoers eye too, but there are still a few surprises. Cary Grant's performance is what really sells the whole film, he's fantastic in this.