The main problem i have with it is purely the speed at which the story progresses and the rate at which they add new elements to the story making it (not difficult to follow) feel rushed. Despite this i found myself being emotionally attached to the characters.
If you enjoy the way the plot develop rapidly without too much explanation and the drama that comes with it then it's a must watch.
I'd say from my experience its most comparable to Mirai Nikki (also watch if you haven't)
