I use the last version 2.1.x and love it. It's stealth everywhere I've checked and I highly recommend it. The newer version includes tarpit technology and I'm not familiar with it or how it works.

http://www.pcflank.com
http://www.auditmypc.com
http://www.hackerwatch.org

are a few more places you can check the security. I don't think you'll have a problem. I use it preconfigured other than having filtering enabled, and I swear by it. It sits there, does its job, and doesn't pester me with pop up warnings. I've got complete confidence in Visnetic, which is really 8Signs firewall, by the way. 8Signs licenses its firewall to Deerfield. The price is the same too.