This one took me awhile to get into. The beginning was pretty vague and the whole dystopian world that Melissa built was very different and required a lot more explaining than the ARC gave me. Everything felt kind of rushed and I was already thrown into the "meat" of the story before I even learned why this was all so important. It's key in dystopian novels that the world should be detailed (not too much though because I tend to get bored) and give the reader a sense of why the main character needs to rebel and how crazy -evil the "powers that be" are. 
 Thankfully though, Melissa assured me that the newer ARCs & the finished book will have a prologue that takes place roughly 7 years before her story starts, and she gave much more detail at the beginning of the book. Things really didn't pick up until halfway through the book, but after that point, I pretty much flew through it. Maybe with the revisions the beginning will flow better and make things blend easily. 
 So, with that aside, I'd have to say I enjoyed Gravity. Ari is a pretty cool female lead, not as tough or snarky as I like them, but definitely not the "damsel in distress". My only gripe would have to be how quickly she fell for Jackson. Sure, he's the typical good-looking, cool guy that any girl would fall for, but she seriously fell in love with him without as much interaction as I would've liked. I need to see more build-up and romance and there just wasn't enough of that, although maybe that's just how it is with dystopian novels. But I could see how Jackson would be able to fall for Ari (his POV towards Ari is a bit different than how Ari views him), and if you read the story, you'll see what I mean. 
 I really like the idea of the Ancients, an alien race whose fate intertwines with the human race.It's very different and I'm eager to see where Melissa takes it. All the characters were pretty interesting and they all add a decent element to the story. Let me also say that the ending is pretty crazy! I knew something like that was going to happen (subtle hints throughout the story), but man, it leaves you wanting to know the truth, which will hopefully come in the next installment. 
 With the right tweaks that I know Melissa is sure to give it, this could be a stellar series. I'll be looking forward to reading the next book, and actually re-reading Gravity to see how it all changed.