I'm not the type of man that dribbles down my leg over fancy language and appearances. Your thread would probably get a little more attention if you weren't speaking as if you're dribbling down your own leg over a shotgun. But I'll go ahead. It's definitely a neat shotgun and as a guy that was working on (ok, dabbling into the realm of possibilities of) multi-tube fed shotgun design ideas before Keltec even dropped the KSG on us, it definitely speaks to me.
My thoughts, it's a short, maneuverable, single-purpose (defensive) shotgun that does offer some great features with only a few problems and drawbacks.
I'm sure you're aware of the many good points so I will point out the bad points.
#1 the design of the top rail and it's interface with the plastic housing is bad. As an engineer, I understand WHY they chose to do it that way but it opens up the rail to damage if you were to ever go down hard on the gun etc. The entire top rail is cantilevered over the barrel with only about 0.75" of metal-on-metal contact at the very rear where it attaches to the trunion. You have to disassemble the 2 clamshell halves of the grip housing to see/know this. The rest of the rail has an interdependent support relationship with the plastic housing and forward grip. The rail helps support each of them, and they each help support the rail.
#2 It gets VERY finicky with 3" shells. The bolt throw and ejection port opening are at the bare minimum to cycle 3" so when you get 3" shells with casings slightly longer than average it starts stove-piping. My buddy had about 30% stove pipes running Federal 3" buck.
#3 The charging handle is non-reciprocating. Some may see this as a plus. However, I've found that sometimes it will hang up partially into battery when feeding. When this happens, because there is nothing to push forward to help it close your options are to smack, thump, and hit things until it jars it enough to close, or rack that round out onto the ground to clear it then release another shell and pray it goes into battery. I honestly have considered seeking out a higher power spring and opening up the gas ports a bit hoping to increase reliability. My purpose for such a shotgun are purely defensive. I really don't want to be futzing with feed issues on a defensive situation. Making the charging handle reciprocating or adding a forward assist would have gone a long way in relieving that concern. For now I hope it comes out of it as I get more rounds in mine. They say 250 to break it in. I'm somewhere around that mark.
#4 I'm sure this is by design to prevent unintentional mag rotations but I've found the rotation release to be a bit too stiff to reliably release it with the back of my trigger finger. I hope it loosens up because moving to press it with the tip of my trigger finger takes extra time.