[Catalyst] what's the point of Catalyst::Model::CDBI::Plain?

[Phil Mitchell]

Right now, in my app, my model classes simply extend Class::DBI and it
all works fine. By using CDBI::Plain, my models would get
Catalyst::Base and a new() method ... what i don't understand is why
they would want that?

The main reason I'm asking this is I'm giving a talk next week at
Boston perlmongers on my new app, Reef. Since Reef is based on
Catalyst, I'd like to be slightly well-informed on that topic too...