I have to say, what with an optimistic 20-25 min load per REDV, a good V-brick system is just way more plug-in-and-forget. To really make a REDV system practical I think the RV dual or quad modules are necesary - but at what cost?
x, etc offer excellent Brick-mounts for a fraction of the Module prices; and a nice pair of 150W V-bricks WITH chargers can be bought for under $550 (total!). All with hours of hassle-free operation.
I think, unless $$ is no object, or demand for tiniest form-factor is an absolute, the Brick-route will pencil out with lots of coin left over for the inevitable other must-have-goodies...