I know they have their fans, but I don't like Weinmann or Dia-Compe centerpulls at all. The arms are way too flexy for me. If you search you'll find that some riders add a booster, or solid link, between the two pivots to try and stiffen them up.
The only centerpulls I like are Mafacs. They are, by far, better than the others (for me). Serious stoppers.