There is nothing wrong with either ZA or Sygate. I have used them both and I prefer ZA because, for me, it is easer to work with. Its my understanding that firewalls all do pretty much the same thing. The only one I have ever had trouble with is Outpost. For some reason it will not install on my machine. It is the only program (firewall or otherwise) that has give me the blue screen of death on this computer.
You should check out clocker's link to the Shields Up test, as that is an impartial third party test that is well put together and quite thorough.
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