Well I've been riding my raleigh competition and international alot lately. The competition was set up with Universal 61 centerpulls and the international with the apropriate weinmanns, 610's. Both were given some modern brake blocks, I forget the brand, but to me the difference in performance is very noticeable. I never really cared for centerpulls, switching them out for sidepulls whenever I could, but I had always simply dealt with either weinmann or dia-compe calipers.
By far I think the universal brakes provide much more stopping power and modulation. Any opinions would be greatly appreciated. I was going to put some weinmanns on the competition just to make it correct but now I'm not so sure.