What are the advantages and disadvantages of using effort, in kundalini yogas, as opposed to the grace of the guru, in siddha mahayoga, to awaken kundalini?

Since every practitioner brings his own unique inclinations and obstacles to the practice of yoga it is very hard to generalize on this point. In terms of actually awakening kundalini gurus of Siddha Mahayoga claim that the kundalini is more easily and reliably awakened by the grace of the guru than by individual effort. In my limited experience I would agree. with this assertion. While not every long-term student of either practice necessarily shows signs of kundalini awakening it is amazing how many people have had instant awakenings of kundalini through initiation from siddha gurus.

In terms of encountering difficulties along the path the siddha gurus would also claim that fewer problems due to kundalini awakening, such as mental imbalance, are encountered by students of Siddha Mahayoga. Here I think the results are mixed. It seems to me that the guidance of the teacher in either Siddha Mahayoga or Kundalini Yoga is more a determining factor than which style of kundalini practice is employed.

Generally speaking each style of practice has its strengths and weakness. The strength of Siddha Mahayoga is the ease with which it awakens the kundalini. The weakness is that because the kundalini is so easily awakened by the guru students of Siddha Mahayoga often have completely undisciplined personal meditation practices. Time is spent instead to trying to recreate some of their initial experiences by following the guru around hoping for his or her grace Some people spend 20 or more years in this manner without ever developing an inner core of practice or experience.

The strength of the family of Kundalini Yogas is that the progress is at least apparently more under the control of the student of the yoga. These students seem more likely to have disciplined personal practices and more of an understanding of how the practice relates to their own experience. Unfortunately for some students this leads to a fairly egotistical approach to their practice and ultimately the kundalini energy is used to bolster the ego rather than to merge the ego in bliss.