Really didn't like it
Barely any kirk-mccoy-spock interplay and what there was wasn't much good. There was one minute where kirk was super worried about spock being in trouble which was dealt with in a pretty weird manner that had me turning back to see if I had missed something.
Most of the book seemed to focus on kirks future leading into the lost years, which is boring as hell, or sulu, which I also didn't enjoy much. The big revelation at the end as to the identity of the aliens fell flat.