the assembly cut (now officially called the "Special Edition" by Fox) really made me LIKE the film! with all the extra scenes added back in, the extra content REALLY stitched the film back together into a dark, emotional and justifiable piece... where as the original theatrical version (which I watched a million times growing up) felt short, incomplete and a bit like an insult to Ripleys character where as the "Special Edition" feels like a complete, detailed, emotional and justifiable end to dear ol' Ellen.
not to say i was happy with Fox's decision to kill Ripley off as we all loved her as a character, but... the "Special Edition" REALLY puts the film back together and makes it a much more enjoyable watch.