Allan, yes, Philip K Dick is one of the better sci-fi writers. Actually, I don’t like most sci-fi, but I enjoyed most of his books when I first read them as a teenager, including the Man in the High Castle. I recommend it for all those who take our existing world for granted. When I first read it, I became mentally “high” on the upside-down world he created.
I honestly don’t know how I’d react to his books today. Part of what he did for me is stretch my narrow mind a little. Now that I’m older, and have seen the fall of the Iron Curtain, and the change and rise of China, I don’t know that I’d find his grand gedankenexperiment such a stretch. Or maybe I am too old to imagine along with him. But I definitely recommend him to younger readers who can appreciate fully his imagination for alternative worlds.