After I read 'The Indinspendable Man' I ran across volume one in a used book store, and I did read it cover to cover. It took him up till the French Indian War. It was well written, but more detail than necessary to really understand the man. I decided not to go for volumes two and three.
For most of us who aren't professional historians, Flexner captured the man in "Indispensable,' and did it very well.