[Zope] ZServer/Apache/Zeus and FastCGI

Does any one have any experience running Zeus with Zope and is it worth the $1700 bucks in terms of performance in the "real world"? Also, I noticed the announcement concerning FastCGI support in the latest Zope release. Will this work with Zeus and or Apache? Is it totally necessary to run ZServer or can Apache/Zeus replace it totally? Sorry for all the questions but I am new to Zope and trying to learn as much about it as I can in a short amount of time. Thanks for the help! Aaron Bostick Exodus Communications