To me, the point of a Benelli is that it is not a pump. I dislike working a pump. It's a distraction on the trap line and for me personally, working the pump is hard because my shoulder is injured so yanking it forward sharply like that would be bad. It is slower. It messes up the sight picture (such as it is)(husband contributed this one; I haven't used ours enough to experience this). And on purely asthetic grounds, it wears the finish off the mag tube in an unattractive way.
Versus a gas gun, I like the quality of the recoil better in the intertia gun. The recoil is not much dampened, but it is slower, so it's more like a hard shove than a punch. Or at least that is how I perceive it. I like some recoil: wakes ya right up! I have not found the recoil painful though.
Also, gas guns tend to be less reliable in extreme weather. This may be a consideration for hunters especially. Also freaks like me who shoot trap in the rain. We'll see if I last all winter.
We keep an 870 for HD purposes, but for heavy general use, I think I will always prefer an inertial auto to either gas or pump. Benelli's rep in particular for reliability under extreme use is another factor that sold me over the other options out there.