Federation and The Ashes of Eden are not only my favorite R-S books, they're quite probably my favorite Trek books, full stop. I also liked Memory Prime, and I must say I share Seigzunt's opinion of Prime Directive. After those two other hardcover events, I expected to be absolutely blown away by it. Maybe that was the problem, that my expectations were unacheivably high, but I found it to be rather mundane, IMHO. But it doesn't really matter, because Federation and The Ashes of Eden make for any mundanities they may have had, with interest.