I am testing it for the last 2 hours and I have to say I am impressed how it works. It looks like it doesn't use a lot of resources, and I also noticed browsers are opening a lot faster now, plus there is no delay in opening pages like in ZA free. I'll see how it behaves in next few days, but so far it looks like a real refreshment after ZA Free on my Vista Ultimate laptop.
EDIT: I have to add that my Vista system was never this responsive like it is now... it really looks like it came back to life. I also installed Comodo Firewall 3 on my desktop (XP) and it works like a charm. So, I guess I jumped the gun in one of my previous posts... Comodo, welcome back!