I hadn't seen Logan's Run since pre-DVD era. It's not quite as entertaining as I remembered, probably for the reasons explained quite well by the All Movie Guide review below. I love sci-fi movies, but so many of them make a huge unbelievable leap setting up the current year's scenario and the viewer is just supposed to accept it.
Logan's Run is set in the 23rd century. So sometime between 1976 and 2276 no human knows what a marriage or family is, what individual committment is, what purity might mean -- artificial intelligence takes care of everyone and no one asks questions.
The tough sell with Logan himself is that you never can tell exactly what his motives are. He *seems* to truly side with the rebels early on but then alerts the authorities to his location. Then a minute later he seems on board with the rebels again. Because Michael York's acting is so intense and over-the-top, you feel like you should believe the obvious. He says he's with Jessica, then he must be with Jessica.
Still, it's a fun post-apocalyptic film and I'll still recommend it. I can't wait to see the remake since word is it'll be more focused on the book than the 76 feature.