Yes, you can use it along with Eset. But, beware that Comodo sometimes can be buggy. You can try it, if you're comfortable with it then stick with it. If you're not comfortable with it then you can uninstall it (Comodo Firewall will also installs a program called 'Internet Security Essentials'. You'll have to also uninstall it after uninstalling Comodo Firewall)
That's what I'm using so I'd listen to CS. Kaspersky free and Comodo firewall work well together and complement each other perfectly. If you've already paid for Nod32 then use it, but if not save yourself some cash.