I'll preface this review by saying I'm not a philosopher in the strictest sense: I never studied it in school beyond incidental exposure and a single 101 class, and I'm certainly not a professor. But I don't think you need to be to enjoy Philip K. Dick and Philosophy. There are a lot of cool ideas that dovetail off of those presented in Dick's work and the movies based off of them (after reading Ethan Mills' chapter "Hollywood Doesn't Know Dick" I am careful to draw that distinction!), so if you enjoy either, you'll probably enjoy the book as much as I did.
I did find myself skipping a chapter here and there ("Yes, I get it, I can't prove the world is real - but I only have a 30 minute lunch break, folks, let's get to something new!") but the vast majority of the essays here are novel, interesting, and thought-provoking. I particularly enjoyed "Just Who And How Many Are You?" by Richard Feist, which, in part, explores a study looking at the duality of the human brain. The ramifications of this study are fascinating. The two sides of your brain are far more independent than you probably realize. Different enough to bring up the question: Are you actually two people or one person?
The book delves deeply into the ideas presented in "Do Androids Dream of Electric Sheep?" (or "Bladerunner" as we Hollywood Luddites may think of it); by the end of the book I was pretty well convinced that we probably ARE all robots, but that I really didn't mind.
Overall, it's well worth your time and nicely segmented, so if you do get philosophy overload but are still enjoying yourself, it's no big deal to put it down for a couple weeks and pick it up when your brain is ready for another thrashing. If you enjoy questioning the nature of reality, wish you'd looked a bit more into philosophy when you'd actually had time in your life to do so, or enjoyed any of the ideas presented by Philip K. Dick in his novels or the movies based off them, do yourself a favor and check it out. It's a cool read.