In "the day" these were simply awful. One tried to forget -- the shame! -- that they bore the brev. Campagnolo stamp.
I worked in a bike shop at the time and, making $1 per hour, it was a stretch to afford a Gitane, even with my staff discount. Of course, the Gitane c/w Simplex deraileurs -- arguably worse than Campag Valentino.
I saved for months to, peice by piece, change everything to Nuevo Record.
Now, in one of my junk boxes, I have a pristine set of Super Record derailleurs, but I actually prefer the look of the NR.