Before flying with it, I played with the unit for several weeks in the house. I managed to get it to lockup ONE time, but one time is once too many! I don't attribute the problem to the iFly software, but rather to Windows --- My simple mind just said to me "You're expecting too much from Windows" and I left it at that. Considering that there is no on-off hardware button, I changed the power source from the master buss to the avionics buss. Testing has proven that I can simply cycle the avionics master and get the iFly to restore within seconds. The momentary loss of power to my radios and nav. equipment isn't problematic - not being able to restore my GPS while in-flight is!
As an aside, I would suggest that anybody flying with sophisticated devices such as the iFly, AND ETC., always have the panel capability to kill/restart the device. In the instance of the iFly, a method to interrupt the power is mandatory. Anybody considering the battery pack as an option should keep this in mind. Any device that lacks its own power button should be wired through a switch. It is just common sense.