I'd do nothing but reading if I could (ok, maybe eat some great food, buy some fancy shoes between two books...oh, and spend some quality time with the gorgeous guy I married while I am on reading-break anyway...)
The characters, especially the main characters remained quite pale and unimpressive during the first half of the book. Very wooden and stereotypical.
Especially Princess Kelsey.
Actually characters and also relationships between those remain the weak point of this stories.
The strengths lie in the story lines and the world building.
It kept me reading.
The universe is interesting, though not completely novel; I think that is mostly impossible at this point, but the history and background story for this one are original enough to keep me reading.
After the very slow start it picked up quite a fast pace and improved with action, space battles, intrigues and coups.