I firmly believe in the use of modules. I think that CPAN and the free and easy availability of Perl modules is one of the key features that sets Perl apart from just about any other language out there. I also think that CPAN is the only large-scale successful example of code reuse out there. CPAN has made the dream of software enginering code reuse a reality. If I can find a module that will do what I need, I will almost always use it. Perl modules also tend to be very clean (bug-free), mainly because of the large amount of "free testing" that they get. I see no reason to re-invent the wheel unless I have a good reason.