A well-written, fast-paced, intellectually stimulating sci-fi novel. But the ideas presented in it are... problematic.
The basic plot: it's centuries in the future, and humanity has colonized over a hundred worlds. A man named Bar Holliday works as a scout, zipping through the galaxy investigating one new world after another. But then he comes to a world where something in the environment causes his body to transform into something non-human; a blue-green, sonar-using, kangaroo-hopping race called the Chozen. The transformation theme is pretty typical of Jack Chalker novels, as is his interest in examining what sex would be like for you once you've transformed into something else.
The main character is a man who believes that humanity has produced a corporation-dominated society of dull, dependent dimwits. There are many comparisons of people to herd animals. The ideas should be familiar; there are an awful lot of people in real life who think they're Bar Holliday... real independent thinkers surrounded by "sheeple". Or "unawoken". And in the end, he makes the decision to spread the agent of his transformation to every human world; sure, hundreds of billions of people die, but he figures those that survive will have much better lives as Chozen than the human society they replace.
Call it "creative destruction"; Chalker doesn't use that term, but real-life people who advocate wrecking everything often do. Of course, they don't usually advocate galactic genocide on the scale presented here. At most, they might be comfortable with something on an "Atlas Shrugged" scale, where the dead might number in the thousands to millions. Maybe Chalker deserves some credit for intellectual honesty, pursuing these ideas to their extremes. But I am unimpressed.