I have had my Shield in 9mm for two weeks now. I do not have the Shield 40 but I do have a Taurus 740 slim. I have carried the Taurus in my pocket even though it is a hair bigger than the Shield but for practical purposes the size difference is so minor to make a real difference. The 740 has a bit more noticeable felt recoil, yet manageable and not unpleasant. The Shield 9mm is a very nice handling gun. If I did not have the 740 I probably would have gotten the Shield in .40 S&W.