My mom bought me a Centurion Lemans for graduation in 1989. I keep it for sentimental value, but darn it, it's still a very pleasurable bike to ride. It glides along nicely and I really can't see the need to upgrade to anything else. I toyed with the idea of buying something where I can sit more upright, but I still keep riding my Centurion (14 miles just last night).
The only thing I don't like is the color, but it was on the clearance rack so we saved a few bucks when we bought it.
Otherwise, I wanted to chime in that I've had this thing for 34 years, it's still my one and only bike, I've ridden it a decent amount and I still love it.
This is someone else's picture, but I have the same bike.
vintage-centurion dhot com/models/sports-rec/images/1988_lemans-pink.jpg