Hi, brandonn2010
I've been a user of Comodo Firewall for 3 years and it works well on my laptop
Ok, Let's answer to your questions.
1. I don't have a machine with Windows 7 64bit but it works flawlessly with 32 bit.
2. Comodo worked hard to reduce the number of alerts in v4(correct me if I'm wrong). You don't get any alerts when browsing or going on Facebook.(using the latest version, 5)
3. You mean 3000KB for ZA and 4000KB for PC Tools, right? In my machine, cfp.exe(main control program of Comodo Firewall) is taking about 5000Kb and cmdagent.exe(Comodo Agent Service) is taking 2000Kb.
4. As you can see in my sig, I use WinPatrol in conjunction with Comodo. They both Play nicely and never had any problem. Don't know about Threatfire though....
Hope this helps