I read The Dialectic of Sex in high school. I liked it, and then reread it a few years later and thought it was kind of silly – especially the chart at the end where she prophecied the end of oppression would lead to the end of death. But it was formative for me and well-written – I think the first feminist book I read.
I don’t know what happened to my copy actually. I may have to buy it again and give it a third read.
Here is a nice obituary which also describes a very tragic ending. It’s where I got the photo.