Brendan, it's OK but nothing special.
It's become kind of popular to examine modern physics (quantum, etc.) in the context of various spiritual traditions, esp. non-dual ones like (some types of) Buddhism, Vedanta, etc.
It was one of the earliest such books, maybe the first, dating to 1979 (I thought it was earlier, had to look it up).
There have been better "popular physics" books since then, so I can only recommend it if you're into the spiritual angle. And there may well be better books with that orientation, though I can't really say.