...With a traditional stock, I could see that it might be something for somebody... but not me.
VFGs can have an application on a pump, BUT
: you need to understand what/why/how of the pros and cons.
VFGs can be useful as a handstop for recoil mitigation when used with the push/pull method.
They can put your hand in a consistant spot to operate a weaponlight.
They can make a squared-up stance more comfortable for a smaller statured shooter.
Longer VFGs are a hazard as far as bumping/snagging the action.
They increase the likelihood that one will "twist" the forend, binding up the action.
Mr. Murphy likes long VFGs
What I have on the gun above is an S.O.G. full size VFG cut down to about 1.5" tall to minimize snagging/bumping and any tendency I may have to torque the forend.
On a carbine, I generally use a magwell hold, and do not like VFGs at all. On semi-auto shotguns, I don't see them as necessary.