A good read, but unsatisfying end. The novel is one of first contact, and is reminiscent of other good first contact stories without being derivative. The human and alien societies are both fascinating and all the characters are interesting.
What it lacks is a strong central conflict... there are plenty of interesting little conflicts during the story but nothing that brings it all together at the end.
Still a good book overall but I can't help but think it could have been a lot better.