kg/Whr rating is still less than LiPo/LiFe
Awesome tech but in this developed country it doesn't offer a significant advantage over lithium cells.
That being said, it will provide a constant voltage as opposed to the voltage drop from Lithium cells, so will operate at maximum efficiency over the course of discharge. Most Lithium's waste energy as the buck converter steps down the voltage from ~8v until the cells go below 2.5 when they can no longer provide 5v required for operation (so your average 18650 lithium cell can only use about 80% of the available capacity)
Cool tech no doubt, definitely awesome once it gets better!