The $20 program battles spyware from a different approach than most other antimalware apps. Using its extensive knowledge of firewalls, ZoneAlarm Anti-spyware uses firewalls as a basis for providing protection. Unlike most popular antispyware software, ZoneAlarm scans commonly affected system areas rather than your entire computer.
While this method scans faster than other options and is mostly effective for catching intruders, I find a comprehensive system scan to be more desirable. Still, people familiar with the popular ZoneAlarm firewall software will recognize the intuitive tabbed interface and newcomers should acclimate quickly.