I love Dean Koontz's books. If I'm remembering correctly, "Whispers" was the one that started it for me, since I have such a total bug phobia. I can't even remember them all after that, since I pretty much read everything up until maybe a year or so ago. I just don't have the time to keep reading his books on top of the list I already do, so unless one gets extra praise or I'm extra bored, I don't generally pick up the newer ones.
I think what really hooked me on him was an interview he did years ago about his depression and childhood abuse (again, if I'm remembering the right author). He was very candid about it all and it made me want to read his books again with the new perspective on the writer.
Koontz is a lot like Stephen King for me in that once he started delving into the space alien theories (Tommyknockers, anyone), I lost interest and he got bumped down my list of authors that I had to buy. I like the books about psychos born and bred here on earth, they seem scarier