Obviously, I listened to this book because it was narrated by David Tennant, and, yes, it was completely worth it. I have not read any other Doctor Who books, but I do enjoy the show, especially the witty 10th Doctor with amazing hair ;-)
This story was typical of a Doctor Who episode: creepy alien invasion, somewhat campy dialog, inevitable victory. Tennant's narration was a pleasure to listen to, as he read in his native Scottish accent unless he was reading the Doctor's dialog and he suddenly slipped into character.
An enjoyable listen for any Doctor Who fan.