I had a Motobecane Grand Touring I bought in 1981. It was a really nice rider - fast and seemingly effortless. And it was riding several of my friend's Mirage and Super Mirage bikes that sent me to the Motobecane store - Harris Cyclery in Newton, MA - and purchase the GT.
All was bliss - until some ditz backed out of her driveway, without looking behind her first, at a high rate of speed. I took her insurance company to the cleaners.
You've got one of the best "baby-boomer" bicycles of all time. Just beware: The ditz in-the-driveway."