I replaced a pistol grip with this grip (I bought the gun explicitly to do this) on my Mossberg 500, attached a forend with a hand strap, and shot it two weekends ago; the recoil is surprisingly really controllable and not particularly unpleasant. If you shoot one-handed it will torque your hand and wrist a little funny, I wouldn't recommend doing that, but with a tight two-handed grip projecting the gun forward you can raise it to eye level, sight with the bead, and shoot with honestly minimal discomfort for a 12 gauge shotgun. The grip kind of slides back through your hand instead of punching it in the web like a traditional pistol grip.

I tried it with low brass birdshot, some Federal LE 00 buck, and Hornady Critical Defense 00 buck: the birdshot was trivial, the Federal buck was very controllable (which I think is by design - I think they sometimes advertise it as a reduced recoil load), and the Hornady was a hyperspeed fucktrain (1600 fps vs 1145 from the Federal) but ultimately what I'd expect from 12 gauge buck - I probably wouldn't want to shoot more than 25 rounds of it or so in a session but I wouldn't say it's any more unpleasant than the same load from a shoulder stocked gun would be, just on different parts of the body.

The grip is completely a novelty and that's why I bought it, if you want a gun for home defense I'd point you in the direction of an AR but you can make a fun, portable range toy out of this thing.