Well, I have a Peugeot PBN-10, which I discovered today (after following advice from another thread), is from 1979. That also has a Carbolite 103 frame and in the year or so since I've owned and ridden it I've been very impressed. Having said that I've never riden a high-end bike so have nothing impressive to compare it to, but I think it's a great frame to use for commuting and for distance. I did 45km, so about 28mi, a day, 3-5 days a week, on it for about 10 months and it was great. My only problem (and this was me just being a **** cyclist!) was that I couldn't get the hang of using the frame-mounted gear shifters so, in the end, I just set the gears to something generically useful and rode it as a single speed bike.

Neil