I've read a lot of his books, but not all of them. I read one every once in awhile, I can't get on a Koontz binge because most of his books are all frikken chase scenarios LOL, have you noticed that? He's good at writing about running and escaping and pursuers LOL.
Have you ever read any Robert McCammon by chance? He has a set of maybe 6 or 7 books, hasn't written in ages now, guess he stopped. But his books are the best of the best, even above Stephen King in my opinion. Just try ONE, Swan Song. Just the one book. Read it, and I bet you will be wanting to read all of his books after that, I BET YOU.