Opposite to many other readers, Mac never annoyed me in the first books of Fever series. I think she was fine enough character. (Of course when she turned into Mac 2.0 she became better). And I know that when Dani appeared in the Fever books she also annoyed a lot of people. But again, not me. 
 So I've never had a problem with Dani being a main heroine in the spin-off. She is smart, sharp, resourceful and funny. 
 Sometimes she irritates me with the way she speaks, but she is only fourteen, so it is understandable. I would be more upset if she didn't act like a teenager sometimes. 
 But the age is where the problems of this book lie. And it is not because 14 is too early to be a main heroine in a book that is not even YA. I wouldn't have any problem reading about Dani's adventures. But this book obviously have romance in it. Moreover, as in Fever, the romance is not healthy. And no matter how hard I tried to accept it, 14 is way to young age to be a romantic interest of two grown-up men. It's creepy. No matter that the accent is on that they will wait until she'll become older, they nevertheless desire her right now. 
 But while I think Ryodan is amoral for desiring Dani, he is too much like Barrons for me not to like him. As with the Barrons, there are no easy answers about whether he is good or bad. You either take him with all his questionable morals (or lack of them) or leave him. 
 If you are afraid to read this book because you don't like Dani, I think you still need to pick it up. Because Karen Marie Moning is a master of character growth. Just look at Mac who has changed so drastically in her books. Jericho Barrons made himself a woman he could love and I think that Ryodan will try to do the same. 
 Except the age problem "Iced" was a powerful entry for a spin-off series. Karen Marie Moning once again managed to create a completely unpredictable read with tight tension, non-stop action, plot twists and with hard men, who emote raw sexuality. And all this taking place in graphic, creative, and striking world.