Many comedies age poorly, but I thought that this one has held up pretty well. Lots of special effects (which have also held up pretty well) but the comedy does not get lost in them. Murray does his absurd deadpan, Ramis his low-key deadpan, and Ackroyd his high-energy weirdness. Sigourney Weaver proves that she has comedic chops. Still pretty good, not great.