It’s too bad Manchester died before completing the last volume. However, Reid did a good job of finishing it. His prose was not as magisterial as Manchester’s, but Churchill’s own quotes and writings provided enough majesty. I am currently on the last volume of Churchill’s biography of the Duke of Marlborough. I had read an abridged (worthless) version about 10 years ago.
I got the first two books, way before the third one was published, not realizing it was a trilogy. I got partway through the second book before I realized events weren’t moving fast enough to conclude in two volumes. By then, I was completely sucked into it. But, the third book still hadn’t been published, and wouldn’t be for another 5 years. I was not a happy camper. I kept up an ongoing search for it. It wasn’t until the third volume came out that I realized Manchester had died, and that’s what caused the delay. Still, amazing biography, and totally worth reading.