Regular middle of the road Suntour derailleurs outshifted Shimano's and Campy's top end stuff! This was not only proven by the people that owned and raced the products but also documented in Consumer Reports back in the early 80's. Suntour Superbe and even Cyclone overall was lighter and far more durable then Shimano or Campy stuff. BUT, there were a couple of companies that had lighter rear and front derailleurs then either Suntour, Shimano or Campy, those were the Huret Jubilee last generation (the one with the holes drilled into the the cage) and Zues which also had the holes; the Huret was the lightest at around 120grms-lighter then today's Campy Record which is at 187grms!!!! But the Huret and the Zues did not shift anything like the Suntour and in fact were known to shift sloppy and race teams in Europe being sponsered by either Huret or Zues were frustrated over the crappy shifting.