I also loved it and never felt that I was ploughing on - I was hooked by the first page - and if I remember correctly the the fact that Bunny is killed at the end is revealed at the very beginning? It was the why that had me hooked. I also hated the Little Friend.
I have just read a novel called The House at Midnight by Lucie Whitehouse, which has been compared to TSH, but is a pale imitation in my opinion.