I found reading this book a strange experience. It's a gripping read, very thorough in terms of detail and research, and it brings the realities of war into sharp focus. I couldn't put it down, despite the fact that I was on holiday and should have been out sightseeing.
Despite getting great enjoyment out of the book, it also left a rather sour taste in my mouth. The author is primarily concerned with the American contribution to the D-Day operations - fair enough, since I take it he's American. However, he is openly contemptuous of the role of the non-American forces involved. The Canadians get a slightly condescending, brief mention. The most offputing factor was his treatment of the British soldiers though - according to Ambrose, the British took on the 'easy' beaches, wandered ashore, had a cup of tea then packed it in for the day. Not only did we not do much on D-Day, but we scuppered the American soldiers by providing them with our amateurish, ad-hoc kit. I found this kind of stuff slightly offensive and disappointing. The one plus point in this regard is that he keeps his mention of British troops to a minimum, so you aren't reminded of his bias too frequently.
The book is a flawed yet entertaining read, and it has motivated me to do some further reading on the role of the British troops in the D-Day landings.