I enjoyed Volume One, and found Triumph in Adversity to be a strong, intelligent, and happy read. Irving has a vast knowledge of the war and Churchill's role in it, and his sweep of events is never dull. For its size, it is a very fast read. The illustrations are rich and attractive.
I also liked Irving spending time on the bombing campaign, and how Churchill felt he needed it to keep Britain fighting, and how he enjoyed the destruction it brought on Germany. Also, this is a crucial volume, as part one showed Britain getting beaten over and over, Churchill making some bad tactical decisions, but in this book the tide begins to turn, Hitler now the one making eventually fatal errors. The problems of the allies, especially in dealing with De Gaulle and Vichy France, are especially well-described and documented. I also liked the study of the conflicts in the alliance between America and Britain, and Roosevelt is well described, as is a growing annoyance with Churchill. His visits to America were now referred to by Americans as 'The Man Who Came to Dinner,' a houseguest you can't get rid of.
This highlights something I enjoyed, and that is Irving's sense of humor. I've heard him lecture, and his style is very warm and humorous, and it comes out in Triumph in Adversity.
I'm looking forward to reading volume three of this wonderful series.