This was a fun read, with a fascinating premise. The moon's an ancient space ship? Cool!
I've been a big fan of Weber's military space novels for a while now, and this one doesn't disappoint. It's from the early stages of Weber's career, and every once in a while you can see ideas and scenes that get developed more fully and smoothly in his later novels.
The book was very hard to put down at the end, which is probably a good sign.