Angel Beats! was an DVD I was hesitant of buying but I decided to purchase it and it was more than I could had ever had hoped for.
At first the story seems like a simple fantasy but develops into an emotional story where everything seems to tie together. The characters are loveable and the music is among some of the best I have experienced in an anime.
Basically what I'm trying to say is if can't make your mind up whether you should buy Angel Beats! or not take my word for it, you won't be disappointed.