No matter how long you have worked in EDA field, this is one book you want to own (and get a copy for the company library). Even after 18 yrs in the field, I read this book often, it is an excellent source for references. I often read it to get a broader understanding of EDA, as well. This book is easier to read than almost all EDA books (even proper text books). Most chapter are written by authors of other EDA books, so it also serves as a introduction to most EDA books.
I just hope it gets updated every 5-10 yr to keep it up to date. I recommend buying both volume, but both volume are independent and you can buy just one based on the area you work in. Essential book for interviews as well.