I agree, Mavic built beautiful stuff (except maybe for the "starfish" crank which I never did warm up to), but they are definitely not superior to other brands when it comes to mechanical performance.
This Mavic "Erector" type RD and FD on my Peugeot shifts nowhere near as well as the Simplex, Suntour and Campy derailleurs I had on the bike in previous years.....but dang it looks fantastic on the bike, and I'm not racing anytime soon in the future anyway....
I still wish I could one day put together a full SSC gruppo for another French bike I'm soon to take delivery for, but I'll give the Dura Ace gruppo on it a try first before starting the hunt for the SSC components for it..I suspect that the DA components might stop my quest for the SSC gruppo after a few rides....
Chombi
84 Peugeot PSV
85(?) Vitus Carbone Plus 7 (Coming soon!)