[Zope] ZClasses

Hi, I am getting started with Zope and really enjoying it. I am reading the Zope book and tumbled over this comment: Anonymous User - Apr. 29, 2004 10:57 am: According to the ZopeWiki, you should NEVER use ZClasses. http://www.zopewiki.org/ZopeDosAndDonts Anonymous User - Sep. 25, 2004 1:10 pm: Why do I learn about ZClasses if I am not supposed to use them? (I checked zopewiki, it really says you aren't supposed to!) Should I use ZClasses? If not what should I use instead? Eddy