I am impressed. I bought this as I knew so little about Stalin. I normally read full-length books (and was looking for one when I saw this) - I would certainly buy a similar book in future where what I want is an overview to cover gaps in my knowledge. Its brevity is a massive advantage. Despite its brevity, I did not feel that I was reading a dumbed down version - not at all. I am actually pleased that I bought this rather than a full-length book.
I read this book over a weekend. It held my interest - I did not find it at all boring. On the contrary, I found it very interesting.
I was impressed that, even when a chapter ended with Stalin's death, I was only 60% of the way through the book. "What follows?" I wondered. The answer was three very interesting chapters ('Stalin's Historiography', 'Stalin the Man' and 'De-Stalinisation') and two appendices - 'Key Players' and 'Stalin Timeline'. Those chapters reinforced what I had already learned from the book and therefore aided my learning. The structure of the book, therefore, is in my opinion excellent.