Gopi Krishna's book is an extremely well written and clear account of the effects of actually awakening the kundalini energy.
For all those people who think they are doing kundalini yoga or are really doing kundalini yoga with all its exercises and breathing routines, this is an essential description of what can happen if you 'do it right' - the effects of the exercises. It is also a warning to those who dabble in this area without understanding what can happen - if you do not understand the process and its effects. Some of the effects experienced by Gopi are dangerous and traumatic, they could have killed him or sent him insane.
His book does not tell you how he did it, because it is clear that Gopi Krishna was unaware to the very last what he had done that others hadn't to get this effect. He practised deep meditation and breathing exercises, but then so do and did thousands of others who have never had these experiences. So don't expect any instruction on techniques, but as a description of effects and a sort of cautionary warning it is marvellous.
The only thing that mars the book is the pompous, trite and clearly totally uninformed comments throughout the book that have been added as a 'psychological commentary' by James Hillman - who clearly has been no closer to a spiritual experience than a bottle of whisky. Miss his comments out and you have a brilliant book. Why Shambala felt the need to add them in I do not know, it detracts from the contents and is a real annoyance.
All that Gopi Krishna wrote is absolutely spot on.