I've got a myriad of brakesets spread out among the rigs in the quiver; SunTour Superbes, 600 Arabesques, D/C 500G's, XTR M900 canti's and XTR M950 V-brakes. They all stop perfectly fine for me, and I ain't the slimmest one in the paceline, either. Personally, I think it all comes down to the right levers, spring tension, and maintenance. Zukahn's right; with the right combination even a D/C 610 centerpull brake can stop a wheel with sufficient force to do the job; adjust and lube the two pivot bolts, make sure the pin is in the groove, have the correct straddle cable and yoke.