To many Mouse served it's role and things are moving towards Moo and the 'internal' mop. As this may be true, Mouse still does great job when you need a comprehensive OOP system, and a fast one.
I've been using the module for almost an year in a 24/7 prod. environment with a large system of more than 30 classes and roles. It works as a charm, and I have seldom missed Moose specific stuff.
To the author - keep this module updated. Many appreciate your work.