OK, first off, know that I have a bias against science fiction stories that are set in the far future (in this case, 9,000 years from now) but the characters act and live just like late 20th-early 21st century middle-class Westerners. It's just not believable to me and I think it lacks imagination.
Setting that aside, it's a reasonably good yarn about a duo of antique dealers who make a living pillaging the ruins of civilizations on far-flung worlds, to the annoyance of archeologists, surveyors, and museum curators. They find something that sends them searching for a semi-mythological ancient civilization—kind of like Atlantis, only it's a lost planet.
The plot moves along OK, but don't read this book looking for character development.
Some interesting telepathic aliens.
Contender for the "Silliest MacGuffin" award (a 9,000 year old plastic coffee cup).