After looking through many different options for self hosting email lists, I am currently focusing on PHPList and Interspire Email Marketer.

If anyone here is experienced with either or both scripts, can you post your reviews?

Insight on the comparison between both products from anyone who has used both would be really helpful.

PHPList is a free option and Interspire Email Marketer is a commercial script. I would be using the software to build opt-in email marketing lists and would be interested in their stability with large lists, tracking abilities, ease of use, etc, etc. Basically anything important to self hosting large email lists.