Finished the first book, "The crown conspiracy", and I'm giving it 4 stars.
I can't wait to read Avempartha to see what Hadrian and Royce are going to do.
I really liked Sullivan's writing for its conciseness and efficiency. Nevertheless it's an introductory book with a simple plot, but very good characterisation and worldbuilding. Since the the first book has around 3oo pages, I'd say he's done a great job. I'm sure we are going to discover more in the second book.

3.75 stars for the second book.
I found the second part more focused on characterization than plot, but I enjoy it nonetheless.