I would too. A few years ago, I built a pair of omnis and demonstrated them at the UK's Scalford show.
Subjectively, they lacked precise stereo imaging, but equally, didn't have the stereo 'sweet spot' that conventional forward-facing loudspeakers have.
The frequency response measurements I took were pretty awful, but that may have had something to do with the drive units I used, which were a nominally full-range driver with whizzer cone. Used conventionally, that driver was very coloured, as are pretty much all drivers with a whizzer cone that I've seen, but possibly by virtue of the reflector cone that converted the upwards firing driver to horizontal omni, it sounded less coloured as an omni.
I think that omnis have the benefit of driving the room more evenly, so provided the driver(s) used are very good, results should also be as good as the room allows, but, with the proviso that stereo imaging is less precise.....much like real life really...... Ideal for naturally recorded classical music where the audience normally sit in the reverberant field of a concert hall, possibly less good for rock/pop etc which is assembled from bits and pieces recorded at different times in different places.
At a classical concert, if one listens with eyes open, one can normally identify where each instrument is playing from, but with eyes closed, it is much more diffuse, and lacks precise positioning. At home with stereo, lacking the visual clues of musicians' positions, I find the precise imaging I get from stereo to be helpful.
S.