Being a big fan of the duo that is James SA Corey, and a big fan of Star Wars, this sounded like a match made in heaven to my ears when it was first announced a year or so ago. Unfortunately it didn't really deliver. The story itself was quite predictable, though still somewhat enjoyable, but I kept getting the feeling, reading about Han and Leia and Luke, that it came off very much like Fan-Fiction. And in a sense, I suppose that is true, Ty Franck being a huge nerd (That's not meant as an insult), it probably is Fan-fiction, just a published one.
I think the major problem was that the book's protagonist was Han, a character that is so set in stone in my mind (and probably many millions of others as well), that it makes it near impossible to get any character development through the book, the character is already fully developed as it is.
You get a few fun moments where you can go "oh, that's so typically Han", and it's great fun, but it doesn't work when you read some of Han's lines in Harrison Ford's voice and it just comes of as something Han wouldn't say.
It is very telling, that the best part of the book was the final epilog titled Silver and Scarlet, that revolves around a completely different character. In those 5 or so pages, I got something I felt was missing throughout the book, a character that the writers could give life to on their own, without any "baggage" from other sources. In those 5 pages I found the things that made me become a fan of Daniel and Ty, hell, in those 5 pages, we got more interesting development in support characters than we got for the main characters in the book. I wouldn't mind reading another Star Wars book by these two, if it revolves around this character, with at best, some cameos from the "main cast" of Star Wars.