Good point. There seems to be a lot of issues with the performance ignition systems. Visit the drag strip. Everybody runs MSD and everyone has a extra ignition box or two. What does that tell you?
Hell Mike I carry a spare orange ignition box in the trunk of my street car.
After failing a 6AL box and an MSD pickup I switched over to an complete FBO ignition sytem 3 years ago and haven't looked back.