How do Macbeth and Banquo feel about the witches' predictions?

Banquo warns about the nature of witches. He thinks they tell good news only to stab people in the back. Initially, Macbeth tells Banquo he doesn't have time to talk about the witches, but they can talk about them later when time allows. A few lines later, Macbeth alludes to the fact that if Banquo stands by him.... there will be a reward for his loyalty. Macbeth is immediately obsessed with what the witches have told him.