I read the book in primary school and it was excellent, but I bawled my eyes out at the end and got really upset and vowed never to read it again.  A few years later, I did read it again, got all upset again and vowed that this time I definitely would not read it again. Up to now, I haven't.  Maybe I would be able to cope with it better now (I am such a soppy thing)! 
  
At secondary school we were forced to watch the film and I got upset all over again.  
  
It really is an excellent book though.  When I got my own pet rabbit, I named her from the book (Acorn)!