Far more useful than a static vertical grip. - FAB Defense 7-Position QR Tactical Folding Grip

The seven different angles this thing can be set at means that there is likely a way to configure this that most everyone will find useful. As another reviewer noted, if a vertical foregrip isn't wanted, it can be tilted in a way that it works like an angled foregrip. The screw cap at the bottom of the handle has a type of rubber gasket that looks like it will keep fluid out of the storage compartment. The storage compartment has enough room to hold one CR123 battery, which could be useful to anyone who likes to run EOTECH holographic sights, or the Sig Romeo 8T red dot sights.
The release button used to change positions is rather stiff, so trying to switch angles on the fly could be a problem. Best to set the desired angle ahead of time. The quick release lever makes putting the grip on and taking it off a breeze. The grip is a little on the thick side, but that's probably to give the section that pivots some extra durability to stand up to bumps, shocks, and maintain sturdiness through repeated position changes. Considering the great price optics planet is offering these as of the time of this review, it's definitely worth getting one to try out. My guess is most new buyers will end up keeping it on a rifle.