I have this program, and like it.
AeroDrag, seems like a highly improved version of wRASP. It's not as design intense as RockSim or Space CAD but it does some really great calculations. This program will calculate the drag coefficient of regular designs (with up to 3 sets of 3, 4, 6, or 8 fins) and tube finned and ring finned designs. It also does flight simualtion and a semi-manual optimal mass calculation. You can generate thrust curves manually or edit the ones already in the motor list. The program also does open-nose or ramjet style nose cone simulations. At a price of $30.00 it provides an advanced coefficient of drag calculations and basic flight simulation program that could be used in conjuction with a stability prediction program like AeroCP ($10.00). Its fairly straight forward software to use; be sure to read over the instructions under the help menus.
I also have a lot of respect for AeroRocket. You can pay for the software online and can download it almost immediately.
Bruce S. Levison, NAR #69055