I'm a huge fan of White Star. But what I liked about the product was it's simplicity. Here it becomes bloated.
Backgrounds, Homeworlds, and Skills are added on as well as a huge number of new Classes. But the core engine isn't really designed with all of these add-ons in mind. The foundation is too narrow to support it.
To contrast; White Star Original was a great alternative to something more complex like Traveller or Stars Without Number. But here we've got just as many options, and as much versatility as those products, yet with far inferior execution (due to the core engine not being designed to offer so much)
Is there a big reason to purchase this product if you already have white Star and it's Companion? Not in my opinion. It collates those products well. But adds little new aside from gorgeous art and an easy-to reference layout.
That being said; It's still a solid product. Clunky and improvised at times, but with a love of it's source material (both thematic, and mechanical).
[4 of 5 Stars!]