Rotoscoliosis in my back at 56 yrs of age has all but eliminated 3:00 or 4:00 carry of my Glocks so am pocket carrying a 640-1 if up close defense is necessary. Definitely makes a difference with comfort and mobility. Next CCW renewal I plan to add a 60 pro-series for appendix carry. Good to have the option of slow/precision single action shots with it as well.