You won't see extra kick against a GM distributor.
Some claim better starting, I haven't owned anything but GM, so I can't comment. I CAN say that my GM setups have NEVER failed me, eveen though most are as old as the vehicle.
Obviously, pieces fail from wear, but nothing out of the ordinary. Dyno resulsts aren't used in ignition advertising because HEI is plenty for "low" (non-racing) RPM's. You can upgrade the coil for better performance, but again, HEI is plenty for a non-race motor.