It took me a while to read the book because I did it in tiny bits of 1 or 2 tips a day, but it was really insightful and fun. I don't like some tips and love many others, but the whole set is consistent and TheDamian
makes his point clear.
In fact, I haven't been programming in Perl for a few years (I've been making lots of Perl scripts and fixes on existing Perl code as part of my sysadmin job, though). However, as I was discovering things like insideout objects and modules like Class::Std, I felt I needed to spend more time with Perl related stuff again (as in my old days of CPAN Testers), specially OO programming and testing.
By the way, don't forget to give a try to Perl-Critic, which implements many of the book guidelines. There's also an online version.