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@Steff
631 is a bit stronger than 531, but yeah, mainly the difference is TIGability as I understand it. My Dave Yates course bike is made of it and is stunningly comfy and not notably bendy (YMMV if you're Mark Cavendish or something).
http://www.reynoldstechnology.biz/downloads/materialcompweb.pdf has some pretty graphs of comparative properties of Reynolds toobs.