Although I liked learning more about Hana and seeing what she was doing the whole time Lena was running around, I found her story to be a bit boring. Nothing really exciting happened and it's a lot of inner monologuing, which I don't really care for. 
 Probably the best part of the story was the (not-so) surprise at the end, which, if you read the first book, you'd totally understand. It does a great job of setting up the scene for Pandemonium and I really want to see what happens between her and Lena once this all comes to the surface. 
 I suggest reading it if you have time or want a more complete picture of the whole Delirium series, but Hana doesn't compare to Delirium in the slightest.