The complete story is on Neil's website and is worth reading about. Clicking the amygdala is similar to the ignition switch on your car, you have to turn it to get things running. But if you don't leave the driveway, you won't get anywhere. Eventually you are going to run out of gas, and I don't think they deliver. You certainly don't want to stop once you get the hang of it, and it promotes health rather than depletes it.
Nature rewards new life sustaining thought and behavior with amygdala pleasure response.
Brain self-control produces similar effects to drugs since one is using many of the same synaptic systems. However, there are differences between internally self activated neurotransmitter changes and those effected by use of external drugs. It is impossible to generalize, since drugs themselves vary widely in their effects and after effects. In the same way that one can combine different drugs for different effects, one can combine self brain stimulation with the infinite other external and internal controls. What one is after is automatic and habitual positive brain self-control.