I've been wanting to see this film for many years but for some reason it's always passed me by. Well, I saw it last night and ,to put it mildly, I was blown away - this is one of the creepiest films I've ever seen, for me even better than the more feted Rosemary's Baby and Repulsion. Polanski himself is great as the nice Polish fellow who moves into the apartment block from hell, the eccentric supporting cast who bedevil/try to help him is also first class. There's an intensity in the use of colour and sound here which is totally unnerving - by the end I was fearing the next appearance of the colour orange - sounds ridiculous, but see the film and you'll know what I mean. The Egyptology vein running through the film is also brilliantly done - its 'mummy' will haunt me for the rest of my days.
In short - absolute classic - if you love being spooked or just love great filmaking, buy this.
To confirm previous review - no French audio track which is inexplicable considering we get Italian and German. Shame, typical Paramount - hopefully Criterion or somesuch will get the rights and do a decent edition.
Footnote - This film shares not only the same producer as Mulholland Drive (Alain Sarde) but also its terrifying old couple - coincidence?