I have finally got around to reading this, and I was mostly riveted. I've never even seen the film, so this was all new to me, and I was genuinely compelled by the androids, and by Decker's interactions with them. Decker himself is surprisingly thoughtful and interesting, which is a lot more than I get from a lot of the heroes of science fiction from that era, so points there. I was a lot less enthused with the whole Mercer thing, though, and just the thought of trying to figure out how the ecology functioned in the absence of animal life set my eyes to twitching. I'm not sure ecology was really a concern for Dick, here, but what I did like, more than anything else, was the devotion everyone had to their pet animals, and how much taking care of an animal was seen as necessary to human well-being, even if that animal was a simulacrum. I'm particularly interested in ecological grief within the science fiction genre, having written on it myself, and this seems like an early engagement with it - with so little animal life left remaining, it makes sense that the rare survivors would be so cosseted and cherished.