Dura-Ace freewheels, IMHO, are among the best ever made. My favorites are the later models with the Uniglide tooth profile and splined remover tool. Earlier Dura-Ace freewheels were mechanically excellent, but had standard tooth profiles that didn't shift as easily as the Uniglide teeth. The early freewheels also used a two-prong remover (compatible with the Regina/Everest/etc. two prong standard) that is not as sturdy as the later splined remover.