Tony Daniel’s 2001 novel Metaplanetary was the first volume in a trilogy. It was followed in 2004 by Superluminal, which was followed in turn by … nothing. For some reason — not, as far as I can recall, for poor sales — Eos declined to publish the final volume in the series. Having read both novels in the existing series (in the wrong order, an approach I cannot recommend), I can authoritatively report that every strength and weakness in Metaplanetary was present in greater degree in Superluminal. Whether that means you should buy both books depends on how you feel about Daniel’s particular strengths and weaknesses.