While I thought the premise was very plausible, the pacing was atrocious and the characters were flat.
I wanted more of Panic and less filler!
The romantic relationships were quite refreshing, particularly compared to what I've come to expect from YA contemporary, realistic fiction (well, most YA, really).
Overall though, the writing was poor, the pacing was way off, and the characters were underdeveloped. I really did enjoy the overall plot.