On reflection, I now recognise the book as being an excellent work. The only reason I have awarded it four stars out of five is that I have also read "Ubik" - which is so excellent that I cannot judge "Do Androids..." at 100% in comparison.
The book is more subtle than the film, and includes a lot of Dicks subtle examination of the human condition, which, over the years, had led him to accurately predict several technological innovations to come, not because he was up on technology, but because he knew the sort of thing we'd end up doing. The story contains electric animals, since the real ones have become rather scarce, one of these being the electric sheep owned by the main character, which he pretends is real to save face. One of my favorites is the device which can change your mood: When you don't feel like changing your mood, you can dial in a code to put you in the mood for using the machine! So, given that we are now cloning sheep, I would suggest mood-machines and Androids are on the way.
If you're new to Dick, you're also new to his unique ability of being able to weave a puzzle that will take at least half the book to unravel (or so you think, until you reach the end, and you realise you were wrong!): So, if you haven't read his material before, start with this book - and stick with it - wait a while to let the neurons settle down, and then read his best work - "Ubik". Most of his other works are also worth a read, and some are excellent, although I don't have space to list them all here.