it feels odd to say that a book has “noticeably aged” when it was only released in 2017, but honestly that’s the case with this book.
i completely see how 7 years ago, a ya book about a trans girl (where the plot isn’t entirely about her being trans) would’ve been practically unheard of, and in that respect i love this book. every piece of literature exists in the context of the time period and the place it was written in, and that truly goes for this book.
in terms of the book’s content itself, i did find the superhero aspect of the book to be pretty lacking. the worldbuilding feels very basic, and none of the superhuman characters feel unique. 
i love how, even though when danny transforms she’s extremely pretty, that being pretty doesn’t solve all her problems (although the idea of her transforming into essentially model levels of beauty standards seems a tad dated).
over-all, if i were recommending trans ya books for people today this may not be on the list, but i have massive respect for what it did and tried to achieve