I believe it has a design flaw in that the pump/slide/fore grip and its built in Picatinny rail are molded plastic and subject to breakage if a broom handle is mounted. A KSG should never have a broom handle installed on the slide. If you break off the broom handle you risk exposing your pump hand to the muzzle! (Google it)
I believe a hand guard on the forward grip is mandatory. Otherwise, after a hundred or so break-in rounds I like it very much.
Neither of these is my KSG but they all look alike to me and I do have the Magpul hand guard installed.