A friend installed the MSD Atomic on his Superbird last year. I think it is nice that you have to look hard for it to see it.

So far it is a mixed bag, but it is still early days. The car lights instantly which is pretty cool. Fuel mileage was not improved at all. Driveability has improved as the system has "learned". It had a bit of off idle stumble, but I hear it has gotten better. He is going to move the fuel pump into the tank as he experienced a vapor lock issue with it mounted just inside the rear of PS rocker panel.

Overall the system has not been a rousing success, nor has it been a failure. But it was expensive. We will see how it goes this year.