My opinion of this book will probably change--especially as I have it as a paperback so i'm clearly going to read it many a times. Currently, however, my thoughts on it are somewhat jumbled, even as I was reading my impressions were about as consistent as a yoyo. 
 Now I shall attempt to explain why and spoiler free! 
 start of the book -- boring 
 I liked the idea of incorporating synaesthesia (especially as we've been doing it in philosophy) but I just didn't buy into it from her at the beginning. I also thought that the flashbacks and progression of time seemed far too forced. It didn't flow at all and I could literally see the author trying to mesh the different time frames together in the writing. Things like "Back in the present" and "There'd been nothing in that memory to tell me" make me a bit suspicious of the writing style. 
 part way through to about two thirds in -- interesting and even more interesting.You might even say I'm enjoying this... 
 The whole dynamic of the Pine Hills mental institution was pretty fascinating and the little line to take pills totally reminded me of One Flew Over The Cuckoo's Nest (1975) which can only be a good thing. We started to get to the good parts in terms of characters and her synaesthesia. 
 Last quarter or whatever -- Wait, whut?? WTF is this? NO SRSLY WHUT?? 
 And this mildly predicatable plot twist threw me right off. I don't know why! I read the shelf categories on the side of goodreads and I was expecting something like it, but it just seemed a bit too ridiculous. I normally have no problem buying into plots like that but only if they are well done. Here it felt like a tacky sidestep attempt on a storyline. 
 And thus I cannot decide whether I liked the book or not. I was being nicely led along and then, WHAM, the floor just sorta went up from under me and I was reading a completely different book. I felt the same after Stephen King's Dome. I'm like a little kid who can't decide if she's been tricked or treated. :(