I just happened to pick up a copy of this the other day at the bookstore. I must say it is likely one of the best of the Apollo 11 books I have read. It was written by Collins himself and he manages to convey his sense of their challenges quite well. If you have seen him interviewed in the file "In the Shadow of the Moon" some of that personality comes through in his writing.
Overall I am sorry I did not read it earlier and can highly recommend it.
Overall I am sorry I did not read it earlier and can highly recommend it.