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3.0 Beta 2 (Aug 25, 2007)
So far, ESS is one of few firewalls that work under Vista. I have Home Premium, so I can't comment whether it works on Ultimate. I didn't try Kaspersky yet so I can't speak for it. But Zone Alarm for Vista is not fully functional, it is heavy. Outpost and Comodo don't have Vista versions.
So far - ESS has strange settings menus, you have to dig deep to change settings. Having automatic mode is good for average consumer user. More computer savvy will prefer interactive mode. However this mode will produce 10-16 popups for some programs connecting to internet, like Firefox. That's little bit too much.
So far it's stable and light on resources, uses about 15-20 mb on my machine. For a BETA this is good