I am in the midst of "re-reading" vol. 4. I put it in quotes because when it gets to twenty pages of reviews from New York newspapers of a Mahler concert, you can bet there is some skimming done.
Vol 4 covers less than four years, but is 1, 758 pages!! But the punchline is the subtitle: "A New Life Cut Short".
But I love this and vol 3 very much; sometimes there is a whole world in a footnote. Rather like a Mahler symphony.
I would love to read Vol. 1, but $200 is a lot of schmekles!