The crankarms are as good as anything Stronglight, which is very good indeed. Most chainrings are on the soft side. However production continued through to the era when Stronglight finally began making good hard rings. If you find them in original packaging the hard ones say 'Zicral' very prominently. Lasts just as long as Campy. The rings are also still remarkably available. Most eBay sellers have no idea which alloy they have and if they don't show the package you don't know either. But if they show a Zicral package it's worth more. Hilary Stone has a large selection at the moment (and usually will) and his price is not terrible. Rings go all the way down to 28 teeth. There are also some Gebhardt rings around from Czech Republic and those are good too.