I have zonealarm. It works quite well.
Comodo became to annoying and troublesome. Once zonealarm "learned", then I was fine.
Comodo needed to keep learning and became a royal pain in the a**
I used to have zonealarm on another PC and tried to download it to my current laptop BUT for some reason it wouldn't work so i've now downloaded Outpost and i'm quite happy with that SO FAR
Mac