@charles1dad I suspect the Cube Audio solution is of higher quality (17,000 euros for the two Cube subs vs $3200 for the Swarm), but at the end of the day you've still only got two sources of bass and all the standing wave issues that that brings.
Obviously many people can obtain sufficient bass performance in this manner by adjusting speaker and listening position, but four (or more) sources of bass spread around the room is really the only way besides room modifications to truly smooth out those inevitable peaks and valleys.
Imagine a rectangular wave pool with actuators on only one end vs one with actuators on all four sides. If I worked with Duke/AudioKinesis, I would construct a small countertop model and allow people to see the different standing wave patterns created as you add actuators around the space. You'll move from large standing waves to more of an even chop with smaller peaks and valleys as you do so.
In any case, like you said, it would make an interesting comparison. And agreed, horses for courses.