Solaris is a *nix, so really it's not so different from any other unix box. I usually develop on Linux and install my code on the production server that runs Solaris (<10), without any problem. Plus Solaris uses Perl for it's install, so it's pretty well tested. Sun provides, or at least used to provide, patches to make sure they can run a proper version of Perl.

On the down side, I find package management on Solaris sucks. It's so easy these days to grap an RPM or .deb of any open-source software on a linux box, and to get everything installed in minutes, that using Solaris seems like going back a few years, when you had to hunt packages, hand-compile (and sometimes patch) a few of them, and generally waste a lot of time.

So in short: Perl runs just fine on Solaris, but I found it a pretty backwards platform for general development.