My instructor just came back from Rob Pincus' Combat Focus Shooting Instructor Development course and was nice enough to lend me the book, Combat Focus Shooting: Evolution 2010, Rob Pincus (on Amazon). Interesting read.
He also pulls in the Tony Blauer SPEAR Personal Defense Readiness program. You can find it on the web, or if you are in Northern Virginia, http://www.novaselfdefense.com/, Evan is an awesome trainer.
Bottom line, it incorporates your reflexes, natural responses and addresses a lot of information that makes you think. I got a lot of feedback on marksmanship vs defensive training. A gun isn't always the first answer and I believe it is import to understand at least the basics of personal defense to get you through the initial attack and on to an armed response, if needed.
Drills and marksmanship are fundamentals, and are still critical. Learning to shoot one handed, do your handling with either hand, important. Then, learning to take those skills and put them into practical application and think through real life situations...PRICELESS!
Some people say shooting competiton simulates reality, but in truth, you study the course, plan your shots, and yes, there is stress, but it is the stress of waiting for the timer and then executing your plan. In real life, the bad guy(s) may not react like targets or your plan.
I don't know enough to share all the details here, but I'm learning, and plan to learn more. I just wanted to toss this out for you to consider. If you carry for personal defense...you need to be ready, physically, emotionally, and mentally.