I quite enjoyed this book. I felt that the writing flowed well, and the plot was good. It's definitely its own book, despite the Pride and Prejudice connection. 
 Rather like the way that P&P has minor appearances by the domestic staff, Longbourn has only minor appearances by the characters of P&P. While the events of P&P are referred to and weave through the background, and occasionally the main plot of this book, it definitely takes a back seat. It's a very interesting way to approach the story, and I thought it was great that Baker gave the servants their own lives and interests entirely separate from the family they work for. I was able to enjoy the story for itself, completely apart from the Austen connection, and that's great. The book also didn't feel like a money-grab via the popularity of Austen re-imaginings(though not all of those are bad by any means). This one is so much it's own story that it feels much more genuine than many other Austen-inspired works. 
 It was a fun read, and once I got into it, I breezed through quite quickly. There's certainly not as many layers to this story as P&P itself has, but it was a very interesting perspective on Austen's characters, while at the same time being an entertaining story in its own right.