I can't help but notice the similarity between these speakers and the Linkwitz Lab Pluto. From a technical point of view, I prefer the Plutos to the SoundSphere's more traditional implementation (the Plutos have an extremely low crossover to improve the dispersion pattern, and they have an infinite-baffle enclosure). But the SoundSpheres are of course much better looking, in addition to being wireless.
If I were to buy something like this, I'd prefer to buy just a single speaker instead of the pair, for two reasons. First of all, a single speaker avoids the cable between the speakers, further increasing wife acceptance factor since you'll only have a single power cable.
But more importantly, since such a large part of the sound of omnidirectional speakers is generated by the room acoustics, you'll get a more tidy sound scape by using one speaker only, especially when this is close to being a point-source speaker. A single speaker would be very beneficial in a living room setting when you don't necessarily sit in the sweet spot, but rather move around. With two speakers, there would have been a lot of comb filter effects when moving around in the room. With a single point source speaker, the biggest change is in the acoustics, but these change just like any other sound emitting object in the room, and therefore the speaker sounds like a completely natural and well-integrated part of your environment.