Online Armor Free
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Full user review
"So far, so good--no problems."
Seems to be an effictive firewall.
Doesn't seem to update on a daily basis--that might count against it. Threats change daily, and uninstalling an older version to get the newest version seems like a lot of work.
If you need a good, free firewall, then try Online Armor. I used to use Comodo, but when they added the anti-virus to their defense, it didn't work well on my system. I'm using Online Armor with AVG anti-virus, and both programs work well together.