Poor licensing and license counting. Too easy to configure. 300MHz G3, System 8.6, 160MB RAM, probed with Nmap and Cybercop Scanner. Pros of Mac OS based firewalls Easy setup, inexpensive, Mac OS, they do the job. Cons of Mac OS based firewalls Logging is poor, Flexibility is poor.
Freeware firewall is inexpensive, open source, and highly customizable.
However, no commercial support, open source, and steep learning curve. About Logging Log as much as possible. Create graphs, summaries, alerts. Daily and Weekly reports. Save the logs.