I find the book to be comprehensive compilation of the GST Act along with all the Rules, Notifications and Circulars. The GST is a highly delegated legislation, therefore most changes come by means of Notifications. Also GST being a new experiment in a large and varied country like India, frequent clarifications and procedures by means of Circulars, Order etc. have been coming at a rapid pace. Within a short time, the law has therefore become bulky and scattered. 
I want to congratulate the authors for bringing out a mammoth and structured work in the form of "Complete GST Law" in 2 volumes. The book provides a one stop reference wherein all contextual publications on a subject matter under GST are cross referenced. I have no doubt that the book will quickly gain attention and appreciation of tax professionals. I wish the authors much success in their future endeavors.