I like Moose but I work heavily in non-persistent applications. Sadly this makes Moose 's start up expense too much. But recently I revisited Mouse (thanks to a friend). The last time I looked at it, I misread the documentation and it sounds like it was no longer being supported by the original developer. But not anymore, w00t! The one part I really like about Mouse (and Moose) is the declarative nature of creating accessors (and therefore attributes). I really like this because it reduces the number of simple accessor tests that you need to write (saving time, tendium and kittens). I used to use Class::Accessor but I always ran into inheritance and validation issues (which I used Params::Validate but this caused lots of custom magic for inheritance). I think the Mouse / Moose syntax is significantly cleaner. Compare Class::Accessor: package User; use strict; use warnings; use Carp; use base qw( Class::Accessor ); __PACKAGE__->mk_accessors( qw( id username pass...