I've just finished Omega. It's been a couple of years since I last consumed all his previous works and there are two things that stay consistant in Jack's writing.
First, he's created what has to be one of the most original universes in SF. Second, he always leaves a major plot twist unaddressed in his writing.
While this is not his best work, Omega continues both his habits. He starts dropping hints on the alien's absense of children, but that leaves open the question of their longitivity which is never addressed.
It's also implausible that the Monument Makers, with over 2000 years to stop the Omega clouds never tried what the heros tried to save the people of Lookout.
So it's a bug that brings down civilization, and not the bomb, but in a very readable style, Jack takes the reader on a tour of the North American continent of the future that reminds me more of an Edgar Rice Burroughs novel I once read than most of the gendra. BTW, while I don't remember the name of the novel, the ERB version is still worth a read.
One of the few examples of scifi that comes up with a creative method of star travel that doesn't disagree with know science. Well written cultures and an excellent study of first contact. Every hard Scifi reader needs this book.
