The TangoDown Shorty VFG is interesting in that it’s not round, or symmetrical. Some thought was put into making it ergonomic. The length of the grip is just long enough to get my whole hand around, but it’s not really designed for you to put your thumb around the back of the grip. The stubby grips are really for people who put their weak-hand thumb pointing forward on the weak-hand side of the carbine.
The o-ring-sealed compartment in the grip is just large enough to hold 2 CR123 lithium batteries, while still being sealed watertight by the o-ring.
The quick-detach mechanism is made by American Defense Manufacturing. To remove the grip, you push in the release button and flip the lever out ninety degrees. You can then pivot the grip off the rail without sliding it off the end of the rail.
I think the QD lever is worth the small increase in price over the standard TangoDown VFGs. I can remove the grip to get the carbine into a rifle case, if necessary, or just to shed weight. I can also swap it over to other firearms quickly, without tools or removing rail covers. It’s also compatible with a wider variety of non-spec rails than the standard VFGs.
I like the QD lever of the Larue products a little better than the ADM lever, but the ADM lever is quicker and easier to adjust. The Larue locking mechanism is more positive. It’s possible to only partially press the button of the ADM lever, which won’t allow you to move the lever. However, adjusting the Larue lever required a wrench and some trial-and-error. The ADM is quick and easy to adjust by turning the screwhead opposite the lever. The ADM clamping system is less likely to mar your rails than the steel tab of the Larue locking lever that actually holds the mount or VFG to the rail. The big tab on the bottom of the steel Larue lever bears directly on the rail.