@erik_squires - looking at them, I think the two drivers firing into the tubes work in a similar fashion to current Ohm Walsh designs. Except for the deepest bass, the sound radiates into the room off the back of the speaker cone, the part exposed in this design, using the bending wave principle. This design has limited treble extension, so it is usually augmented. In the Ohm Walshes with a conventional dome tweeter, and here, it seems, with a flexing tube, along the lines of MBL. My concern, if I were looking for a true omni, would be the blocking of the rearward soundwaves by the tube. MBLs, Ohm, German Physiks all are designed to allow at least some of the sound to launch straight behind the omni driver. It would seem this design precludes that to some degree.
As with any type of speaker design, the implementation is where it will succeed or fail. The design type itself is secondary.