This book provides a wonderful insight into the universality of the Bhagavad Gita, which transcends all space and time and applies to the entire human race. Swami Rama was a very accomplished Yogi who has had the experience of the absolute truth, and the words used in the book are more than sufficient to confirm this. Along with explaining the verses from the Gita, he also gives an insight into the Himalayan Yoga tradition every now and then, and how it relates to the Gita.
I have come across many interpretations of the Gita by many 'masters', but Swami Rama's version is one of the most profound versions I've come across. One of the verses in the Gita clearly states that for a self-realized soul, the Vedic knowledge is only as important as a pot of water, when there's a huge reservoir of infinite knowledge available all around. And Swami Rama can certainly be considered to be one such soul, and the quality of his writings speaks for itself.
I would also recommend "The Path of Fire and Light" for actual Yogic techniques that result in spiritual transformation. Also, another book I'd recommend is "Choosing a Path", that gives a very objective and non-judgemental assessment on the different ways of approaching the Infinite Spirit, just like different rivers merging into one vast open ocean.