This is a very nice tool for experienced users. It is a very rich and stable application. Net admins usually prefere to use the shell terminal to configure ipfw firewall on osx/freebsd, but with WaterRoof you can speed up it dramatically. The logging option is great, it's very easy to find entries and to make/understand stats. The manual is too vague, but if you want to use WaterRoof you don't need a good WaterRoof manual... you just need to learn how firewalls work.
This is really recommended to every net admin searching for a fast tool for configuring, testing and troubleshooting a firewall.