Sams book Waking Up: A Guide to Spirituality without Religion basically positions buddhism as the only religion which from a rational point of view has something real to offer, in its focus on meditation and the mind. The book focuses on consciousness, no-self and meditation as the path. In my view, he is not entirely wrong, but he is not entirely right either.
He thanks his meditation teachers as Tulku Urgyen Rinpoche, Nyoshul Khen Rinpoche, H.W.L. Poonja, and Sayadaw U Pandita. He also credits Joseph Goldstein and Sharon Salzburg as people he has meditated a lot with. That gives you some idea of where he is coming from, it’s a mixture of classically eastern techniques, what has come out of western Buddhism, and some Advaita Vedanta. He even says in the book that he groups Advaita Vedanta and Buddhism together because he ‘doesn’t see much difference between them.’
Basically his view of spirituality is quite logically deconstructive, he considers effects and gains and losses and from that perspective he is right. But there is not a lot of love in his approach, and it seems to me that without that you are missing one of the essential pillars.