I really liked this. My favorite part was the interrogation of Captain Christopher. That he did have vague memories of his time on the Enterprise.
One part I was slightly disappointed in was the portrayal of Mestral. But that is mostly because I had completely different ideas of what happened to him. I think in the 60s he would have grown out his Vulcan bowl cut to more a mop top to conceal his ears. With his Vulcan mysticism he would have been a guru to the hippies.