[Zope] Are Versions evil?

Are Zope Version objects evil? I'm doing a bit of work on the Zope Book and have stumbled across the section describing Versions (I dont use them myself). I seem to remember that some people encountered bugs using Versions and there has even been talk[1] of deprecating[2] them; on the other hand there isn't much in the way of bug reports about Versions in the Collector[3]. Has anyone had trouble using Versions recently? Should I advise against using Versions in the Zope Book? Thanks, peter. [1] http://mail.zope.org/pipermail/zope-dev/2003-June/019731.html [2] http://mail.zope.org/pipermail/zodb-dev/2004-January/006573.html [3] #922 describes a critical problem but is seemingly hard to reproduce