Considering that biographies of Winston Churchill usually span multiple volumes, I was a little concerned about how one book with only a few hundred pages would do. The answer is, surprisingly well. It hit the high points without becoming too repetitive. It did get a little "second version, same as the first" by the last chapter, but that's because Churchill's life did follow the same pattern--rise to leadership, catastrophe, exile, brilliant return, round and round and round. The bulk of the book focuses on the pre-WWII Churchill, which is a Churchill who's very unfamiliar to American audiences. I wrote my senior paper on the Yalta conference and thought I had at least a reasonable grasp of the facts, but I was shocked but how really little I knew about him before about 1939.
One word of caution: the book was written for people who already have a grasp of the basic history and just need the details filled in, so the author doesn't bother to slow down and explain anything. They will mention an event or place and not explain it what it is, just that it is important. "After X event, Churchill had to change course," without really explaining what X event was or why it was important, in any way beyond the immediate context.