I adore it when through prose we get to see into the heads of characters that we don't get to see the perspectives of in the main show, and that's exactly what this story is.

The insights into Davros' mind are brilliant, and pairing him up with Eleven for these stories is a stroke of genius. His thoughts about The Daleks, hearing how he sees them as his kids is just great, the moments where he talks about knowing the true feelings of the daleks, how they can only feel hate, but how he sees more emotion than that, and you can't quite tell how much of it is delusion and how much is maybe true, maybe they can only hate but maybe there's varying levels in it. The but where he talks about how the daleks would be a lot calmer if everyone else would just die as well was great, and the choice to have daleks fight krillitane, almost exact opposites, was spectacular.

And then the ending, The Doctor's plan to prove to Davros that 'Dalek' can mean something else if he makes it do so, the daleks blowing themselves up and leaving Davros, never to call on him again. The fact that he almost considers The Doctor's offer until The Daleks call him one last time for the Time War.

It's just another great character piece.