MSD Atomic LS EFI anyone run one?

[Solid LT1]

Looking for feedback on users of the MSD Atomic LS EFI systems. Would like to know real world experience with system, type of motor...LS1, LS3....any mods on motor...cam? Intake type. There was a Trans Am at SEMA a few years back with a single plane and 4bbl throttle body running the Atomic LS EFI, that's the exact set up I would like to build. Thanks for the info.