I run NOD32 on a Windows 7 x64 machine. I am considering upgrading to Smart Security, but it appears that the only added features I will gain is Antispam and Firewall. Antispam is of no value to me because I use web based Gmail. Is the ESS Firewall worth the upgrade (and associated costs) from NOD32 to ESS? Or should I stick with NOD32 and Windows Firewall?