I read this book just after reading the book "survivors of Stalingrad", about German suvivors of the battle. Both books are very good, but also very different; this book in particular should be required reading for anyone interested in Stalingrad or the Red Amy in general.
This books contains excerpts from a mass of interviews with various Soviet soldiers conducted during and just after the battle. The soldiers range from enlisted men to generals, from commissars to nurses. Because the emphasis of the interviewers was on "the truth", the accounts are unvarnished and were never published, due to their failure to conform to Soviet stereotypes. The interviewers often spoke with several people in the same unit, so you get different perspectives on the same incidents.
There are relatively few detailed accounts of combat in these interviews, rather they focus on the totality of the experience there--why soldiers fought, what role did commissars play, their impressions of the Germans, etc.
Finally, the editors also did a very good job introducing each interview and providing useful background info as to why and how they were conducted,and why they were never published.