I recently read All That Is. Here's my Goodreads review:
I had two reactions to All That Is - the narrative/story line wasn't much - basically a man who thinks that the next woman is going to be "the one", with a nasty bit of revenge thrown in. That gets three stars. I would never reread the novel for that.
I may return to it because of the craft with which Mr. Salter writes.
There are innumerable sentences, paragraphs, and scenes which I would like to reread just in order to study what the author has done. The revenge passage, for example, was so well written that I was almost able to forget about the evil involved. Five stars for the craft of the writing.