The reason why it causes such a cacophony whenever it hits the forums, is in part because few have been exposed to it and know what it is....
I fully support Nei Gung training a la CMA for those who wish to experience it. But if you do it, you may want to read the warning label..
1. Best results come when taken at 3:30 - 4:30 am
2. Few results anticipated if done in the afternoon or late evenings
3. When your body stores enough chi that is breaks through a blockage, aggressive whipping actions may occur via nerve impulses and relaxed limbs while asleep. Make sure you do not hit your significant other or you may develop a lack of "trust" with your sleeping partner.
4. Before you train too deeply with iron palm, determine how many children you may wish to pat on the back.