I'd read Away From Home (in the same series as this book) before United but I loved Away From Home so much and I really wanted to read more as the books are only 130-ish pages long. So I bought United!
I think this book was great! There was a problem though, these books aren't very descriptive, making the books short and seemsing it's such a good book, I found this annoying because I wanted to read more.
Anyway I thought that this book was fantastic!
Highly recommended!