First of all, it's a Glock and most firearms can't claim the same.
Second, it's a .40S&W which I prefer over a 9mm. IMO, the felt recoil is basically the same between the 9mm and .40 but you get a bit more energy out of the .40.
Third, the 23 is easier to conceal than a 22 and it' fits my hand well.
Fourth, I've owned my 23 for 5 years and it has not failed once. In the thousands of rounds I've put through the tube, the gun has performed flawlessly.
Fifth, I have no doubt in my mind that, in a life or death situation, my model 23 will perform the way I need it to. Any errors made would be operator error but the gun would meet my demands.