I'd read this before, but it's seminal and worth rereading, insofar as PKD is concerned. I find many of his short stories easier to digest than his novels, for with length comes psychotropic aside, which puts me off somewhat. The story; a man waking up after a murder attempt in a world where no-one recognises him and no records of his previous life exists, is thrilling, but the exposé-style nature of everyone's psyche and the interminable digressions on philosophy and sanity takes this out of any mundane realm and into a league worthy of higher contemplation.