Comodo firewall is great indeed, the best free firewall available atm imo. If only the virusscanner they offer was a bit better i'd only use the comodo IS package. I dropped Nod since they changed the way they offer their free version and went with Avira as my basic scanner.
The IT company I worked for sold NOD32 for nearly 5 years...and I never knew they had a free version....then again, I've never had to pay for it either....company always provided it for us