I have just discovered Comodo and am so far impresed.
After having given up on the nightmare Zonealarm has become with it's tentacle like installations similar to that of Norton and McAffee, I found Comodo.
However, for the casual user who doesn't know about the tentacles, there are major conflicts between Comodo and the residual za registry entries and files left behind after a ZA uninstall (they claim it's to "help" users not to be without any firewal

). and they have no interest in providing an cleaning utility to remove all this crap from our systems.
I'd suggest you guys provide a means by which new users can successfully clean their systems of the Zonealarm virus before installing Comodo. Otherwise it makes Comodo look like a buggy firewall due to the conflicts with the the ZA legacy code. This results in BSODs as well as inexplicable errors while running perfectly harmless software on users systems as Comodo attempts to do its job.
Just a suggestion to consider.