The description is rather vague. It claims 2 million voxels and no moving parts. That's resolution of maybe 200 x 200 x 50; the depth dimension seems smaller than the others. Is is some optical system which projects on 50 plates (maybe less), or something like that? It looks like they're somehow optically remapping a projector to multiple planes at lower resolution.

There have been depth displays before - vibrating mirror devices (a mirror mounted on a subwoofer driver) and such. Today we have enough GPU power to drive a volumetric display, at least at the modest resolution of this device.

But it's awfully low-res. Once you get tired of the 3D effect, it's going to be painful.