Since this is a short story collection, I thought I'd talk about each story. I'm going in the order that they appear in Stars Above. 
 1. The Keeper: This is the first story in the book, and it's about Scarlet's grandmother and how Cinder came to be under her care. I really liked it, because we only get a glimpse of her grandma in Scarlet, and we get to know more about her. 
 2. Glitches: This story is all about how Cinder came to live with Garan and his family. I feel like this story gives some insight into why Adri treats Cinder the way she does- not completely, but enough to not really like Adri. 
 3. The Queen's Army: This story is about the army Levana built, and we see Wolf and how he became Wolf! I liked it, but it's not one of my favorites. 
 4. Carswell's Guide To Being Lucky: It's not one of the more memorable stories, and it's not one of my favorites, but I did like seeing Carswell at a young age. 
 5. After Sunshine Passes By: I loved it, mostly because it's about Cress, and how she came to live on the satellite at such a young age. I also really loved Cress- I can't decide if I love Winter or Cress more, as far as the main series goes, so it's no surprise this was one of my favorites! 
 6. The Princess And The Guard: This is another one of my favorites, because we see how Winter got her scars, and why she stopped using her gift. I really felt for Winter! 
 7. The Little Android: This is my least favorite of the group. Even though it's set in the same world as the other stories, we only briefly see Cinder, and it doesn't have anything to do with the other stories. It is a really good re-telling of The Little Mermaid, though. 
 8. The Mechanic: I'm sort of in the middle on this one. It's a scene we see in Cinder, where Kai stops by Cinder's stall to have her fix Nainsi, but from Kai's point of view. Which was nice to see, but at the same time...I don't know, I'm feeling neutral about it. 
 9. Something Old, Something New: After The Princess And The Guard and After Sunshine Passes By, this is my favorite. It's an epilogue of sorts, to the entire series, but especially Winter. I loved catching up with all of the characters and seeing what they were up to. 
 My Rating: 4 stars. I ranged from not liking a story (The Little Android) to loving a couple stories (After Sunshine Passes By and The Princess And The Guard), with everything else falling somewhere in the middle. It's a pretty good addition to the Lunar Chronicle series, and most of the stories (except for Glitches) was new to me, so it was nice to have new stories for one of my favorite series. It's also nice to have all 9 stories in one volume, and it's a great book for any fan of the series.