Before I knew about the sundry Object-Relational Mapping (ORM) packages on CPAN, I wrote my own simple module that does a very small subset of what RDBO is capable of.
After some searching, I discovered RDBO and DBIx::Class, and I preferred RDBO because its interface was the most intuitive to me (or really, it most closely matched the one I wrote). After using it for a while, I have to say that RDBO exceeded my expectations. It saved me loads of development time because the documentation was crystal-clear (especially the tutorial), and the interface was clean and intuitive.
I agree with the previous reviewer that RDBO doesn't have the mindshare of some of the other ORMs, but I hope that changes in the future. I would feel more comfortable with more users to test the code, and I would like to see it integrated into some other web-app suites (CGI::Application, etc).
I'm looking forward to more Rose::* packages in the future.
This module enabled me to embed an interactive Excel spreadsheet into a web page with Microsoft Internet Explorer and Microsoft Office Web Components. web_component.pl, in the examples directory, is an excellent, easy to understand example of this.
Of all the inside-out class modules, I consider this one to be the best. It provides everything an inside-out class needs (accessors, pseudo-encapsulation, thread-safety), and nothing you don't want (cumulative methods, perl6-ish syntax, [string|num|*]ification). Using other modules like Class::Std is like hammering a nail with a chainsaw. Sure, I can cut down trees with it, but all I want to do is hammer the nail!