Everything! The low profile. The Titleist brand. The way it sets up to the ball. The confidence I get. The nostalgic feeling.
There is nothing more to say. If you can get your hands on one of these drivers, please do. They're only $40.00 now even on ebay for the ones in great shape. If you try hard enough, you'll find one that hasn't been abused through the years and only has minor scratches on it that you're going to get anyway from using it.