A story of a clone discovering he's not "real". That's like the movie "The Island". Plenty of explosions in that one, since it is Jerry Bruckheimer and Michael Bay in the production seats, but ignore that and concentrate on the story.
There's a difference in cloning a physical body and
copying a consciousness. How unique is a clone?
Combine it with the artificial
intelligence questions and it becomes really difficult to make a stand. If it was just an inanimate body, without any intelligence/consciousness/soul, I think the modern medical world would be revolutionalized. It would simply become a "spare parts" factory.
Then again, that might be even more creepy.
I'm sure Koontz has opinions on every subject he writes about, but he's probably restricted in making them public due to legal and public relation matters. At least in fiction, you can always fall back on the "it's not me, it's the characters" line.