I started using NOD32 a year ago, migrating from Norton business, and I've been happy with the performance. I recently upgraded to their Smart Security package (w. firewall), as I had been using the old Sygate Office Network firewall, which hasn't been supported in years since Symantec purchased it, for the purpose of eradicating its competition - the best software firewall on the market. NOD32's firewall is very unobtrusive and has all the configuration options I would want.