Neat that this gives you a longer barrel in a more "compact" package, but.....
...because I like to carry between about 3:00 and 3:15, right on the point of my hip, in a holster that tucks the grip tightly to my side, I find that the part of my G19 that prints the most is not the butt, but the rear right corner of the slide, by the rear sights. By moving the slide back, presumably so less goes in my pants, I feel like it would print worse. It's raising that corner even higher on my side, and would poke through my shirt even more.
But maybe I'm just shaped funny and this is an unusual issue.
Regardless, it's refreshing to see some degree of innovation in pistol design. Even innovation for nothing other than innovation's sake has value, even if it is ultimately not an idea I will likely buy into. Much like the Chiappa Rhino.