Yes I remember them as a child - they gave me mega nightmares! I own the DVD box set now, as well as the sequel 'Hammer House of Mystery and Suspense'.
BTW there is already a recent thread about this topic with several replies.
I sometimes think that the old black and white (is that pc to say that? I get so worried about upsetting someone these days) films and those old B movies were by far the best.