I've finished the Cold Equations Trilogy, and it was awesome. I'm reading Allegiance in Exile. Its ok, but its not great. I have a Star Trek question I think fits in here.
Should I read the Eugenics Wars books?
I really like most of the stuff I've read written by Greg Cox (the Q-Continuum trilogy was amazing, some of my favorite Trek books ever) but I HATED Assignment: Eternity. I only made it half way. Its probably at least partially because I have no interest in Gary Seven (his episode in TOS being firmly in the meh category) but its still one of the only ST books I've quit reading halfway. Looking on wikipedia, the Eugenics Wars books are apparently told from the percepctive of gary Seven. Like I said, I'm not a fan of Seven and I couldn't finish Cox's other book with him. But, the concept of the book seems interesting.
I cannot tell a lie. Gary and Roberta are all over my first two Khan books. They do not, however, appear in the third one, which take place during Khan's exile on Ceti Alpha V.