It's books like this that make the great hunt for the perfect read soooo worth it. Because this was absolutely perfect. And that word is only reserved for the worthy. I loved every moment -every line- written in. I hadn't even hit a hundred pages before I knew this would rank in my favourite reads. 
 Who doesn't love pondering over philosophical questions like, "what would it be like to live as someone else for a day?" or, "would you still love me if I looked like (fill in a variety of physical descriptions here)?" It's about time a talented writer like Levithan saw potential in these thoughts and ran with the idea. The results are so unique and fascinating. The story started fresh, and continued on intriguing, and then turned complicated and all the more captivating for it. There wasn't a dull moment. 
 This beauty in this book is that it gets you walking in many different people's shoes (...pun only slightly intended). It keeps things fresh and you empathize with different lifestyles; every chapter is a new day in a new situation. So many characters are covered but it was rendered so carefully that it was easy to keep track. There is so much for the reader to relate to or learn from. Despite the all the differences, it also highlights how much we all have in common. Very powerful work. 
 Though... Before delving in, I read a few negative reviews that oddly made the experience better: they were frustrated at the lack of information given. Those readers wanted the science -the details- of how and why the body swapping was happening. I suggest letting go of the desire for answers now before picking it up; we only know as much as the main character learns about this lifestyle, and there is a lot of ignorance (yet a great deal is discovered). The focus is on the story and getting hung up on this kind of thing will drag it down. Don't let it! 
 The reference to the song Running up that Hill was really nice. The characters sing the lyrics, "And if I only could make a deal with God" ...but the next part that was left out adds an Easter egg to the story: "And get him to swap our places". You could practically feel how this concept could have been inspired from these words. Very cool. 
 Seriously impressed and already looking forward to reading it again someday in the future.