Disclosure: I have original Weinmanns on the Capos, Campa. sidepulls on the Bianchi, and a Mafac front / Peugeot-labeled Weinmann rear combination on the UO-8. Mafac brakes have three significant functional advantages over other centerpulls:
1) the straddle cable can be replaced with ordinary brake cable -- no proprietary double-header required;
2) the caliper's leverage can be adjusted simply by changing the length of the straddle cable (shorter for stronger braking with longer handle travel);
3) the pads' rim-strike angle can be readily adjusted.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069