I found this review of Perl Best Practices (Chapter 15) to be of interest. Considering the reviewer, Dave Rolsky , is a major contributor to Moose (along with a lot of other great modules) it comes from a voice of some authority.

There are some objections (remember inside-out objects?), but overall PBP does quite well according to Mr. Rolsky. I don't have much to add as I agree with his review (I still don't like separate read / write accessors though).