I agree... At front Cisco Pix and a ISA Server as a backend firewall.

There is support for both products. There are many people who have knowledge about both products. When Mart walks against a car ;\) someone else can take his place easily.
Most managers only look at the price of a product but they don't look to the time it takes to configure and support it... A cheaper or free product can eventually become more expensive.
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Co