I also read the first book...it was ok. I want to know what happens, but haven't been able to get my hands on Dragon Sun (book#2, I believe.) Of course, it's a moot point, since obvioiusly the Hive will conquer all and rule the world.
Read them. Loved them. Each one I read forced me to eject the civ3 cd and play a few games of SMACx. Ely does a great job w/ the unexpected (re: Hive), and harsh realities of life on Chiron. I must say the image of Clinical Immortality made me nauseas.