Rayyeti,
That's a nice looking shotgun with a badass looking brake. I've got a brake like that on one of my AR's and I've found it's pretty good at tearing up guncases. After a year or so of owning it (and getting frustrated at my torn up cases) I realized it ain't gonna do serious damage either. Mine has about 1/2" spikes and that's the extent it will go into a person. You'd have to be pretty lucky and catch an eyeball just right to do any serious damage. If you poked it straight into a guy, it's only gonna piss him off. In which case, you better be wearing your badass suit, or that rifle is going to end up in your own ass.
But, I love the thought of a spikey, scary muzzle brake. It does tend to intimidate those that haven't actually considered what they can't do.
Added:
Klr,
Mossberg 500's have been doing everything a shotgun can do and they keep doing it. And, they are "cheap".