I wrote an article on the ten worst dirt bikes for (I think) ADB a few years ago. We recieved all sorts of letters complaining about my inclusion of the TM400, SC500 and others but the only mail we got about the CR450 were horror stories from owners who had been through the dramas of owning one. There wasn't one letter sticking up for the bike.
Back in the day I saw a friends marriage almost disintergrate over the pressure the CR450 repair bills had created. He eventually sold the less than one year old CR450 for half of what he'd paid for it. It had a broken gearbox and the missus wouldn't OK any more money. I must admit though that they sure are a pretty little bike.