I'm still using the
free version of Comodo and have started deploying it on clients' computers. Overall, I'm very happy with it. The only caveats I have are:
1. It sometimes seems to get stuck in sort of an update loop after downloading certain updates. A reboot fixes the problem. It's only happened two or three times in the last four or five months or so that I've been testing it, however.
2. The heuristics, even at the lowest setting, are
very sensitive. There are more false positives than with any other product I've used. But even at that, we're talking maybe half a dozen total since I've been testing it. I suggest not being too quick to delete anything found by the heuristic scanning.
3. The program asks for user approval any time unrecognized code is executed, which has already caused some of my tech-challenged clients to block some of their important, but obscure applications. It's easily fixed, however, by finding and deleting the rule.
4. I haven't noticed the logging problem that Grant mentioned, but this is a pretty powerful machine. I've installed it on quite a few clients' computers, however, and it slows them down less than AVG or AVAST, and waaaaaaay less than Norton.
5. I sometimes don't install the firewall on networked computers that are behind good hardware firewalls, just to reduce the warnings and the chance of users locking themselves out of something. I haven't noticed any subjective difference in performance.
All in all, Comodo's my favorite right now, and would be even if I had to pay for it. I think it's a better product than any of the paid anti-malware products I've used in the last several years. But it's not a good choice for the profoundly tech-challenged because it does occasionally ask questions that require a degree of understanding beyond the "Where's the Start Button?" level.
-Rich