My primary interest in this is as a quick on and off, no-fuss handgun. I can't carry during the day at work for various reasons. I do, however leave work for about half an hour each night to go grab something to eat. Getting a full-size M&P on and off my belt for 30 minutes sitting in the car on a parking deck is a chore. I can see a single stack 9mm being something I can quickly and easily conceal with minimal fuss so I can run into Burger King and grab a burger while wearing my typical business attire.
I'm not interested in it as an all-the-time gun; just as a gun that I can slip on my belt for a few minutes without having to drop trou to hide.