To be honest, I really liked this book!
Melisande was human, raised an angel and fell to Hell.
It's deliciously dark, and its heroine is strong but knows when she needs help (accepting it is a different story, though). The men are mysterious, interesting, and (very) swoon-worthy.
The characters feel real and believable (I really like Vyra!), the setting and worldbuilding ensured an excellent level of immersion, and the story had me engrossed from start to finish.
All in all, great start to the series, and I would recommend getting the sample chapters if you're into angels/demons and reverse harem. Needless to say, I've got the next one queued up on my kindle and ready to go! ;)