Out of curiosity, have you ever had an opportunity to listen to any di-poles at all? Or, for that matter, Bi-poles like Mirage M1s,M2s, etc? If not, you should really try and check some out, I think you might be impressed with how much of the "omni" sound is really reflected back-wave. Without so much output to the sides, panels can actually be much easier to place in a room than an omni.
I do like omnis for their open sound, but I find a similar affect with bi-poles & di-poles without as many room placement issues. Of course most omnispherical speakers sold today do use at least SOME radiation control, so are not "true" omnis anyway. Speakers like Ohm's current line and your Mirages for example, are very easy to get well set up, that wasn't at all the case with any of the fully (or nearly) omnidirectional speakers like Ohm Fs, or Walcott Omnispheres.