RejZoR
15
I tested both firewalls (2.1 Pro and 1.0 Free) and there are only minor changes in functions and a huge difference in memory usage. 1.0 Free uses around 3-5MB of RAM,2.1 PRO uses around 15-20MB of RAM. This is a huge drawback in my opinion. Sure you get nicer icons and interface with more colorful background,but functionality counts not the huge memory usage.
You can change all icons with some resource hacker like Microangelo Explorer so you can change them as you like and with those you like 