This set is a decent introduction to yoga for someone who knows nothing about yoga and has never been involved in any kind of esoteric practice. I don't know why is it entitled "The Lost Teachings of Yoga", since the information presented on these CDs is widely available elsewhere. Most of the information presented here comes from Yoga Sutras of Patanjali. There are also references to Babaji and Trailanga Swami from Autobiography of a Yogi, Gopi Krishna's Kundalini experience, transcendental meditation, and works related to tantra, mantras and hatha yoga.
Few CDs in this set deal with yamas and niyamas (moral virtues) which are presented here in a way that sounds pretty much like the Ten Commandments given by Moses. For comparison purposes, Emmet Fox has written a wonderful book explaining those Ten Commandments but not in terms of "thou shalt not", but rather in a way that makes perfect sense to esoterically or spiritually inclined individual, and I suppose I have expected on these yoga CDs explanation of yamas in niyamas more from a spiritual perspective, rather than from physical perspective.
For example, the author talks how difficult and challenging it is to live by them and mentions that he uses the model of 12-steps from AA to make the process easier. That may very well work, though I have found that since all of the moral virtues arise out of the principle of Oneness, as the individual meditates upon One Spirit, surrendering to it within to the point that he allows it to take over and in that way experiencing Oneness - all moral virtues fall in place effortlessly. If one walks through life with the awareness of himself, his own spirit, one spirit, being present in everything and everyone, he would neither wish to injure another nor to take anything from another; he would not have to struggle to live with conscience, it happens naturally, as the outcome of the experience of oneness. It doesn't take struggle - by embracing the higher, the lower falls off.
The author talks about different branches of yoga and when it comes to bhakti yoga - yoga of divotion - he made it sound as if bhakti yoga is of necessity steeped in duality. For many people, and in the beginning stages of spiritual understanding and experience, it may be so, but ultimately, what one experiences is that one is loving and perceiving himself - one Spirit - One Self - everywhere, and eventually all forms dissolve and only the Self remains. One merges with that which he loves, and in that merging one dissolves in it, and in that merging and dissolution, all forms dissolve also. Such has been my inner experience. This path of yoga leads to the same outcome as any other path of yoga and for that matter it is present to some extent in any other path of yoga.
Overall it is a good set of CDs.