How does a 6-element inverted gradient stack compare with an equally sized delta subwoofer array?

I interviewed the creator of the Delta Array recently and he mentioned how similar it is to the gradient. I decided to see for myself.

Coverage Shape

Forward Aspect Ratio

For a short demo of FAR please see One Simple Tool to Find the Right Size Speaker for Any Space.

FAR = depth / width
deltaFAR = 26 / (13*2) = 1
gradientFAR = 26.15 / 23 = 1.14

30 / deltaFAR = 30
30 / gradientFAR = 26.38

Have you tried the Delta Array in the field? What were your results? Let me know in the comments.