Having read several of Miller's books in the past, this collection of essays marked, for me, a growth point in Miller's creative genius. He is more mature, more aware of life and its vulnerability, more philosophical.
If you like Miller (really like him), you will enjoy this book. If you don't like much past the two Tropics, you will probably have a hard time with this book.
For the record, the two Tropics are my least favorite books of his.