The Fox Inheritance (Jenna Fox Chronicles #2)
Locke did not make a better narrator for one thing. He never really coalesced into a real person. There just doesn't seem to be much to him; he may actually consist only of his love/obsession for Kara and Jenna. Rather than being focused on the ethical dilemmas involved in these technologies like the first book, I felt that the melodrama upstaged those questions.
The love triangle just creeped me out. I agree with Alyss that it's not possible to be in love with two people at once, so I just could not care about Locke and his desperate need to please and be with both girls. The society is what's so interesting here, but the focus isn't really on that.
Much of the plot was predictable, especially the climax. The unexpected things, like Jenna having a daughter, were not happy surprises. Reading over what I've written here, it definitely sounds like I hated this; I didn't, but it was hugely disappointing.