I've shot it in .40. It handled the snap surprisingly well for the size, but not so well that I would own it in .40-- slow to moderate speed was fine. Truly defensive speed was a bit of a rodeo. The safety is too small for me to be comfortable with under stress, and I have an aversion for "just leaving the safety off" and assuming that it will still be off if I need it. Easy to be accurate with. When I fired it, 4 other guys also ran rounds through. Even the casuals shot it well (according to their individual skill level) at 7yds. The owner was stacking rounds with it, but calling him 'experienced' is an understatement.
Ultimately, my personal preference of carrying service pistols and the safety on it prevent me from having any interest in what I acknowledge is a fantastic platform for 9mm.