I bet it has a hell of a kick. But it must be like having a shotgun in your hand, only better because you have more ammo in the chamber before you need to reload.
Not just a hell of a kick, that will be a heavy sonofagun when fully loaded, and there is no way you could fire it one handed if you expected to hit anything.
Looks interesting, but I would reserve judgement on it until I could see how well if fit my hand...