I've handled the Kel-Tec KSG shotgun, and frankly consider it an answer in search of a problem. I don't think it's necessary to have so many rounds in a shotgun; it makes the weapon heavy and (in my experience) unwieldy. If you need that many shots, a carbine has lighter weight, longer range, greater accuracy, and an even larger magazine capacity. Still, there are those who like the KSG, and good luck to them. That's the beauty of freedom of choice.
Unfortunately, the KSG's configuration and its lack of a restraining device on the fore-end can punish inattentive operators severely. The Gun Writer reports on the latest case.
A reader from Arkansas sent me a horrible photograph of what is left of his hand after he shot himself with a Kel-Tec KSG shotgun.
It’s a close-contact wound with a 12 gauge shotgun, something I haven’t seen for quite a while, thankfully.
I decided to make the photo available, to show the damage a shotgun can inflict if mishandled.
There's more at the link. The photograph is gruesome, so don't look at it unless you have a strong stomach.
(I have to point out that this sort of injury is almost impossible with a conventional shotgun. The barrel sticks out at least several inches beyond the fore-end, sometimes a foot or more, so that even if your hand slips off the latter it won't end up in front of the muzzle.)