It still holds up
I never saw this one as a kid like most people here seemed to of. But I did watch it as an adult and I have to say it is a great horror film. Of course the acting is a little dated but that's expected from an old film. But it had a very creepy atmosphere and an eerie score. The little demons were very cool and creepy looking too. And I don't say this about many older horror films. Don't get me wrong I love the classics (Exorcist, Rosemary's Baby etc) but I am normally very put off by dated or corny acting. Not with this film. The story and overall creepiness of the film completely made up for it.
I gave it a 9/10