Look at it this way: Who am I worried about from a wireless security standpoint?
a) A Skiddie
b) A Professional
If the answer is (A), I don't see some skiddie shelling out $500 for software.
If the answer is (B), then the Pro already knows how to crack/hack my network without shelling out $500 for a piece of Windows based, proprietary, closed-source software.
This program seems to me to target sys/network admins who don't know anything about wireless security (or linux) who have some requirement to look at their wireless network and/or whose company doesn't want to pay for a wireless security professional.
Just my .2 cents...