This is an amazing novel, which isn't given ample credit due to all the nonsense surrounding it.
It's not a breezy read. The prose is elaborate: expect long sentences and big words throughout. This is Rushdie's style, and some people don't like it, finding it impenetrable (or aren't bothered to penetrate it). But really get stuck in, because this is a brilliant novel.
The two main characters fall to England from an exploding plane, then undergo wacky transformations into a devil and an angel. Through their tortured London lives, Rushdie explores the migrant experience and the merging of people and cultures. Good and evil are entangled together in the characters of both men. The result is a vast, layered moral/social dialogue.
The narrative of the prophet Muhammed is genuinely brilliant. It caused a big - fatal - fuss, because it depicts Muhammed admitting the existence of the old Polytheistic deities, then taking it back. Rushdie also brings Muhammed's general reliability into question. For instance, he returns from a lonely ramble in the desert, proclaims to have been contacted by Allah, then gives orders accordingly. What's ingenius is that Rushdie never tries to convince us that Muhammed is a liar - he merely raises the prospect. We, as readers, form our own conclusions.
The story is genuinely engrossing and comic. The characters are deep and tortured. Some of the other reviewers on here seem to have been expecting a beach read. This certainly isn't - it's so much more than that!