I'm amazed by how bright-eyed the prose style is here compared to Dick's later works, not to mention the gimmick! There's nothing like a few decades of literary failure to stamp out the pesky flame of exuberance and enable some really great writing.
The man had a truly brilliant mind. His final works, up to and including his death, are the most concinnous possible conclusion to the arc of a life he could have executed. He lived his art.