Quoted:
The only place I could foresee any problems would be in the tube switch. Other than that it's a pump shotgun, kinda hard to fuck that up,...
The shell feed mechanism is probably very tricky, more so than on an 870. After all, it has the added complexity of needing to feed from two sides. That could easily get screwed up. The selector is only one piece of that overall feed mechanism.
The ejection port looks a bit crowded, too. That could get screwed up.
The trigger could be mushy.
If the magazine tubes are perforated plastic, they could get dented/broken.
After viewing the YouTube videos, I was under the impression this thing is light in weight when empty - the recoil for even the non-magnum shells loooked pretty heavy. One thing I like about my 870 is it has some heft to it.