Hi Trizor,
I've only ever used Mail::POP3Client, and have no complaints about it. I found it particularly useful on a couple of occasions when I started receiving large amounts of spam containing rather large Windows viral attachments. I was getting (up to) about 100 of them every hour - damned things were arriving faster than my crappy dial-up connection could download them.

Anyway, it was nice to be able to run a Mail::POP3Client script that just connected to the server every 15 minutes or so, perused the headers and deleted each of the infected messages from the server, without me having to give it any more thought.

I've also used the same module to grab and print the headers and/or messages. I have no idea how it stacks up against the other POP3 client offerings - I've never experienced the need to look beyond it.

Cheers,
Rob