OK, here I go now... it's my turn...
Sygate - GUI - score: 6 (scale 1-10)
ZoneAlarm - GUI -score: 3 (scale 1-10)
Why ? Sygate has very simple, but effective GUI, although I would make it little bit futuristic (not "gamey" style, but little bit more "tech" style) without taking so much system resources on behalf of fancy graphics. I know good way how to do it...
ZoneAlarm works great, wonderful and it looks nice, actually very nice, but sometimes it's very, very boring... just like when you use Internet Explorer. I couldn't find any major problem working with IE, it's just kinda boring. That's why I started to use Mozilla Firefox and MyIE2.
ZoneAlarm should have smaller screen (working area), and that's the first thing I would change in there... second... that ugly big font.
Cheers !