As a reading experience, I might actually have given Knight of Delusions a lower score. On the other hand, I give Laumer credit for developing a virtual reality story years before it was commonly attempted (1972).
A tough guy detective named Florin gets a very strange assignment. He is supposed to guard a senator during a last ditch effort to restore the senator's mental health. Or perhaps he is trying to guard the senator against the advisors who are actually trying to kill him? Or maybe he has some kind of future with the girl who seems to keep appearing in the bar with him? Or perhaps it really is all linked to giant alien lizards after all?
The prose is interesting, as Laumer uses the diction of hard-boiled detective fiction to take on a science fiction subject. It mostly works well, although there are times that it ends up making the description feel abbreviated, and not much time is spent exploring the world(s) the character moves through. My larger quarrel is with the plotting. It almost seemed as though Laumer had a really good idea, and then painted himself into a corner trying to work it out.
Knight of Delusions may well be a good read for people with a particular interest in treatments of virtual reality. The Tor 1982 edition comes bound with two other stories: "Thunderhead" and "The Last Command".