It's exciting - they're hitting the same price point as Bellissimos while promising features akin to Rearz. They'll be a significant improvement on what exists in the market if they pull that off.
I would ignore the stated capacity number - my experience is that diapers hold maybe half of the stated capacity in practice at best, and high-end diapers often run into problems with other parts of the diaper like the tapes failing first. Thus, the actual real-world number is not only going to be much lower but it's going to depend on what part fails first, which may not have anything to do with the absolute capacity. That said, I do really appreciate ABU being transparent about the testing method used to reach that number.