Andrew, what is your use? Unless you are doing something where there isn't any kind of break to swap batteries, stacking isn't useful. If you are in a position to hang the weight of a battery stack, you should consider the full-house AB instead of the V, especially if you have the need for more battery time.
While Brett hates the V, I have a love-hate relationship with AB, developed in the years since I was wearing a battery belt (and dinosaurs ruled the Earth). I currently have 2 cams and 3 field editing decks (all Sony) that take V, and one cam (Panasonic) that takes AB. It wasn't hard for me to go with the Pilot that takes V (which will also feed the cam that takes Sony packs, once I get the power cord built), and even after I sell off the Panasonic, I'll hang onto a couple of the AB batteries and the smart charger.
BTW, Brett, I would point out that the AB is just about as easy to drop as the V -- apropos of nothing, I'll mention that there isn't much left of a battery pack that falls a couple of thousand feet after the gold mount release button bumps against the door frame of a Huey. And some people have asked me about the strip of gaffer's tape I sometimes wrap around whatever battery I'm hanging . . .