Frank as narrator

Frank's voice as narrator is obviously what gave the book its personality. What did you think of the narrative voice? And, for that matter, the lately revealed device of telling the story from death row? Could you imagine the story being written from any other point of view?

( I always find it interesting how first-person narration tends to make you sympathetic to characters you would otherwise dislike. You sort of become their emotional accomplice, and rarely do you think, "Oh wait, I'm just being manipulated and mistreated, too!")