I have mixed feelings about this book. Despite containing some moments of the wit and satire that Amis seems to be able to dash off so easily, it never feels like it totally justifies the price of admission.
Like the central character John Self, the prose feels bloated at 368 pages long. There's a kind of rhythm in the repetition of the constant acts of gluttony, depravity and violence of Self that I suppose you could argue form the basis of the satire. The problem I have with this is that if this book is intended as a satire, it doesn't feel like the aim is precise enough- it's more of a scattergun approach in which all of the targets receive a blast of Amis's caustic style.
What this leaves you with is a fairly stretched story full of unlikable characters (although I did enjoy John Self's dead pan reflections and utter lack of regret on events that would horrify most of us- being thrown out of bars, losing fights, throwing up in front of important people) interspersed with some genuinely funny moments.
It comes down to personal taste, as I know there are plenty of people who rate this book, but ultimately I found it comes off like an overlong speech by a very witty, though very drunk friend.