I have a vast array of center fire rifles and hand guns. However, I also have a couple of 10-22's with the 25 round magazines, as well as that S&W MP-15 in which I have 3-25 round factory magazines. I have no doubt that the S&W is completely reliable in putting out 25-75 rounds out the end of the barrel in seconds. Obviously I wouldn't use it in home defense simply because of the lack of stopping power, and I do have much more adequate arms for that purpose.
Recently I gave a firearms class to an elderly couple, Neither had any experience with a handgun before. They had just purchased a sub-compact 9mm semi-auto. Neither of them could operate the slide, or remove the magazine. I suggested after giving them a safety course, that they take the gun back to the dealer and trade it in for a .22 revolver. A few days later they called me back, and wanted me to go over the handling of the 9 shot revolver they had just purchased. Note I let them both shoot my S&W Model 17, to which they were quite capable of shooting and operating safely.
The moral to the story is any "gun will do if you will do", and they both went away quite confident that they will sleep better at night knowing they will be able to protect themselves if in the event it presents itself. Incidentally they got a Taurus 9 shot .22LR 4" revolver. It kind of looks like a S&W 686, needless to say I had to do an action job on it, but it is quite accurate.