This book hurt to read. While Mia is a bit of a detached narrator, it was still devastating to view the scene of the crash through her eyes, and to experience each of her revelations with her throughout the book. But although there is lots of sadness and hardship in this book, there is also joy and humor. Mia had an overall happy life. She had parents who loved her, a boyfriend who was devoted to her, and friends that cared for her. She had a creative outlet in the cello that the people in her life may not have totally understood, but still supported.
In a way, that happiness made what happened to her that much harder to read about. Her losses were large and meaningful, and it made it easy to understand why she would debate whether or not she wanted to return to a life that had been stripped of so much. There was no clear-cut right or wrong answer, and no matter what she chose, it would have made sense. It also makes her ultimate choice a double-edged sword. I simultaneously agreed with her choice and regretted, along with Mia, what she gave up by making it.
The few annoyances I had with this book were actually not problems with the book, just bits of added realism for the characters. While Mia adored her parents, and they loved her fiercely, as she looked back on her life, she would reflect on some occasions with her parents that she thought were awesome and I thought were questionable parenting decisions. But of course, that's because she's a teenager and these are her parents, and I'm an adult, and a parent, so our perspectives are going to be very different. (Of course, that also has a lot to do with your personal parenting -- and life -- philosophy, and we all know there are as many of those in the world as there are people. So other parents may think Mia's parents are the epitome of parenting, and that's fine too). There were also a couple instances with Adam in flashback that made me raise an eyebrow or two, but again, I understood why they made sense for the characters.
One of my favorite aspects of the book was the use of music, and how Mia, her parents, and Adam were all musicians, albeit very different kinds. Whenever Mia was talking about how she felt playing the cello, or about how her parents or Adam talked about music, I continually thought, yes. This is how musicians think (while I'm not the virtuoso Mia is, I still have a musician's brain). It made me want to go watch cello videos on YouTube (because there are some awesome cello videos on YouTube), or to sing, or to dust off my piano music. I loved how they all related through music, and while they approached it differently, they all understood that the music was the important thing.
If I Stay is a powerful and introspective look at life, love, family, friendship, and how everything we know can change in an instant. It was beautiful and haunting and sweet and sad, all at once. It's not like any other book I've read, and it stuck with me for a long time after I turned the last page.
[Oh, also, I have no idea why the cover blurb says it will appeal to fans of Twilight. While it definitely could appeal to fans of Twilight, it is absolutely nothing like Twilight, except that it features a teen female protagonist with a boyfriend.]