I'd always wanted to know what actually happened at Gettysburg. About 20 years ago, I asked a CW nut friend to recommend ONE book I could read that would clearly explain the battle. He suggested KA and I went out and bought it and read it.
It was somewhat entertaining, but it taught me virtually nothing about the battle itself. I suspect that if you already knew all about the battle, it would have been a much more rewarding and entertaining read.
Then I went to the library and got the Time-Life book on Gettysburg and read it cover to cover and THAT explained the situation about as well as I could possibly hope. Should have started there in the first place.
A couple years ago was some important Gettysburg anniversary (150th year?) and several one-off "collectors edition" books showed up at the local newsstand. I bought two of them. One was pretty good--informative and well illustrated. The other one was full of PC garbage and was at least 50% about slavery, the role of blacks and women in the war, and other such leftist tripe--a complete and utter waste of money.
I did enjoy the Gettysburg movie, though.