An early review of Invisible Sun courtesy of WhatchYAreading:

Oh, the characters. The best thing about these books for me is the fact that the characters are complete people. With sci-fi, it’s easy to get bogged down in the cool world-building and the neat gadgets, but David Macinnis Gill has written two novels now where the neat stuff coexists with these great characters he has given us. The gadgets and gizmos are part of the story, yes, but they enhance the characters. We see the pieces the characters see and touch and use. And we see the way the cool science stuff is literally integrated with the characters. It’s a great balance and it lets these books be action packed while keeping their soul.

You can find the rest of this thorough but not-spoilery review here.