I was absolutely blown away by Rebel. Hellion didn't quite hit that mark for me, but I still enjoyed the story and the series as a whole.
I'm on the fence about how I felt about Quin. I didn't mind her in Rebel, mostly because she was a secondary character. She was a little wild and crazy and brash and that was totally fine for what she was in that book. In this book, however, I didn't see enough of a softer side of her to really grow to like her. I was more annoyed by her, I think. She's just a little immature and that frustrated me more than anything. I didn't dislike her, so much as wish she'd have grown just a little more.
I really liked Mick. He was sweet and perfect and tried so hard to be good for Quin. He interacted perfectly with her family--that was probably my favorite thing about him. His interactions with his own family were tense at best sometimes, but very realistic.
Quin and Mick had pretty solid chemistry. I believed that they really loved one another and I was happy when they finally got together for good.
All in all, it was a good story, but not my favorite by far. It's worth it to get to Trouble, though.