I loved the aspect of getting the story from an awakened echo's perspective. One thing that annoyed me was this weird perspective shift, sometimes mid-sentence. Example "Elyssa and her echoes walked out the door and we walked down the hall." So it was Hope's perspective, but also trying to be outside looking at Elyssa. It was jarring when it happened.
I guessed the ending partway through the book. I knew Jordan was going to lose an echo somehow (or Hope would spawn another one - but we also got that with Marguerite, so I'm not surprised Jordan just lost one), I just didn't know quite how. I'm just glad that Shinn didn't try to redeem Elyssa after making us hate her in the first book.