Only the knock-down-drag-out fight that ends the second act fails to register, in part because Rob Howell's distractingly spectacular deco-modern set isn't cluttered enough to let Elyot and Amanda whip up a sufficiently chaotic mess.
Cyrus is getting older, but she's not in and out of court ( no offense, Lindsay), or getting into car wreck after car wreck ( no offense, Amanda), so isn't the "good girl gone bad" label pushing it?