ESET Smart Security's AntiVirus detection is better than to that of KIS but the Firewall is too basic. And many other advance features are missing which are present in KIS.
I have used almost all the antivirus, firewalls and internet security suites and i find ESET Smart security to be the best. I have configured it to strict protection and firewall is quite good. I used kaspersky internet security before switching to ESET, kaspersky is a very good antivirus but i prefer ESET.
I think everybody doesn't need strong firewalls, after all we are home users. ESET's smart security is enough. I would recommend personal firewalls like Zone Alarm or Comodo for businesses only. For home users ESET is enough.
I have also used Norton Antivirus 2007, Norton Internet Security, AVG Antivirus, Avast Antivirus, Panda Antivirus and many others i don't remember and i wasn't happy with either of them.