So, I read it all in a couple of hours last night.
Second, the story flowed very well... there were no wasted words, everything tied together beautifully.
As for Spock's character, I find all of his actions logical. In order for him to achieve his goals, he had to be just as ruthless as the others in his universe. After all, what would be the point if he allowed anyone or anything to possibly threaten his plan?
All in all, it's a fantastic read. I'm going to have to buy a copy for my coworker, instead of letting him borrow mine... I'm not willing to part with it.