I'm not a Perl addict neither, but I'm using FEX in production and it worked flawlessly for more than a year now and hundreds of users.

Easy to install (inetd/xinetd), easy to upgrade, self cleaning, nice behaviour when you reach the limit, the command line tool are autonomous (just put them in your PATH), the developper is (very) reactive. It just works.

It is as efficient as the website is old-school =) I'm an enthousiastic FEX administrator and user !