[Zope] How big is the biggest known Zope Web Site ?

How big is the biggest known Zope Web Site ? 'How big' means to me things like : How many concurrent visitors at a time ? Internet bandwidth ? Database size ? Number of physical servers/processors ? Another question of big interest to my current project : Is Zope suitable to manage a 'transactional' web site? I mean a web site where each different visitor gets pages with different content. Thanks for every answer !