I did not expect to like this book as much as I do now. It started of very whiny and immature. But then as the story progressed, everything just clicked and felt right. The way Gabi narrated really annoyed me at first, but then after a while it just seemed like that was the way it should be. She was a teenager after-all; of course she would be like, man this guy is hot and bla bla bla. I might have appreciated it more if it were toned down a little bit, but it wasn't out of context or anything. 
 Marcello ... now he is uhmazing. He's bossy and protective in just the right amount *sideeyeingedwardcullen* Definitely swoon-worthy. And Luca, he is a joy to read too. I love sidekicks. Overall I think the story is riveting (at first I was afraid it was going to be like Fushigi Yuugi - The Mysterious Play - however, although slightly similar, they have MAJOR differences) and well, it's great. It's a great, fun read. I can't believe I only started it yesterday night. 
 Oh and of course this is very similar to the Outlander series by Diana Gabaldon; almost exactly the same premise. But Outlander is geared for adults and clearly Waterfall is for teenagers. And I'm happy to report that I enjoyed Waterfall more.