Even though I heard many positive feedback about the the Psy-Changleing series, however at first I wasn't so sure about the sci-fi mixing with paranormal-romance idea. However, after reading Guild Hunter series, I decided I have to at least try to read one book of the series. And let me tell you, I only regreted not to read this series sooner! 
 The whole PsyNet reminded me of X-men, the space it's similar to when professor X uses Cerebro to find mutants and such. Except, all Psy is connected by PsyNet, and without PsyNet, Psy will not survive. There pretty much is no absolute privacy as long as you are part of the PsyNet. 
 Even though this is a paranormal-romance book, but it also has a very strong plot/story. I enjoy reading about the romance between Lucas Hunter and Sascha Duncan just as much I enjoy the development of story.