Private Firewall you miss
Using PF for four years and recalling its use, I would say it's OK for use in many cases even now honestly. Jeff_T is right, though. Main thing that I would be concerned over is if someone could turn off the program, but not once did I run into this issue in four years. Crashes freezes, bluescreens, sketchy programs...nothing has beaten PF on systems here.
Overall, I want to hand credit to Privacyware
for a program that was ahead of its time with self-protection and functionality and FREE and without bugs. Two other examples. No password for settings, but they are stored in an non-editable form (as far as I can tell). Also, The PrivateFirewall service cannot be closed by another process, and PF functions even when the GUI is closed and removed from the system tray. Self-protection. Not bad for a product that was only written as a favor to a customer of Privacyware for his network.
Hat is off Privacyware
. You gave us a program that we could use with confidence and use to imagine what is possible. I would also like to see a PrivateFirewall 8!
BTW, the Comodo Firewall test will show you why it's the best idea to move from Private Firewall. There are some types of activities that it doesn't notice.