With OSX firewall and firewall on router, do you really need Netbarrier?

With the native firewall and what the router provides do you really need to spend the extra money. I understand the need for anti virus but... do you really need something like Netbarrier from Intego?

I agree with Roam, but if you are still in doubt, check these out...
ClamXAV, free Virus scanner...
http://www.clamxav.com/
Little Snitch, stops/alerts outgoing stuff...
http://www.obdev.at/products/littlesnitch/index.html
HenWen/Snort combo, that is a free MAJOR Firewall...
http://seiryu.home.comcast.net/henwen.html
Then the venerable old Brickhoues/Flying Buttress Firewall...
http://personalpages.tds.net/~brian_hill/downloads.html
WaterRoof is a firewall management frontend with bandwidth tuning, NAT setup, port redirection, dynamic rules tracking, predefined rule sets, wizard, logs, statistics and other features.
http://www.macupdate.com/info.php/id/23317

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    Nov 19 22:40:24.132: WV: Entering APPL with Context: 0x86529380,
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    Nov 19 22:40:24.132: WV: http request: / with no cookie
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    http://www.cisco.com/en/US/products/ps8411/products_qanda_item09186a00809aec31.shtml
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