I don't read as much sci-fi as I should, so I can't tell you how this compares to other entries into this genre. But from a purely literary point, it's a good, solid collection. Although I disagree with Varley's ideology and there were several stories which I found unappealing, however, Varley's inventiveness is unflagging and his ideas always provocative. His style is rather plain, which for me is a big negative. (I don't like pointlessly rococo, either.) But he's really not to my taste, stylistically, just as Hemingway isn't. But Varley is definitely unforgettable.
So, if you're a sci-fi fan, I'm sure you've already encountered this author, who is, I'm informed, a well-established, seminal writer in the field. And if you like to be challenged conceptually by works of fiction, this, too, is the work for you. If you are merely looking for a way with which to pass an idle hour, you will be, sadly disappointed.
I can't decide if I loved or hated it, but I was never ambivalent towards his works. However, I, for one, will never forget this collection, which is saying something.