Um, you're joking, right? Perlbrew itself is fine (I use and like it - I actually wrote a small Bash completion script for it[2]), but it implements only a fraction of the functionality of rvm[1]. (Rvm also precedes Perlbrew by some time, I think).

[1] http://rvm.beginrescueend.com/

[2] https://github.com/telemachus/perlbrew-bash-completion