From the reviews:

SIGACT NEWS

„The book is sprinkled with many gems … . The book is a treasure of information and is fun to read … . I loved this book. In fact, I’ve pretty much run out of superlatives … . I would recommend it to anyone who is just curious about pi, or about large-precision arithmetic in general, as well as to the professional who is looking to break the next N-digit barrier. Who knows, perhaps a reader will be inspired to invent a faster yet method for such algorithms.“