I wish to add that gains achieved through low intensity are more stable; I mean, you hear people saying ‘I reached X inches, but then I gave up and my gains disappeared.’. I rarely hear this from people who gained using extenders or low pressure pumping.
Perhaps the gains achieved through low intensity are slower and allow stabilization throughout the enlargement process whereas fast gains are too quick to allow for much stabilization during growth?
If so this would mean one would have to pay particular attention to the cementing process. However, since penile growth seems to be the main focus here, the cementing process should be the easier part.