I have a very similar experience to Foster, the OP. I have had a pair of Mirage OMD-15s for over 4 years. These are the little brothers of the OMD-28s, with a similar array of drivers and the Omniguide, but with downsized drivers and cabinet. I have also had a pair of Mirage bipolar M5si's for 16 years. For a long time I was fiddling with the things that most intuitively bring about more control of the speakers, such as high current amplification, and bi-amping or bi-wiring (I've done both with both pairs). But one day an audiobuddy stopped by with a handbuilt tube line stage and it simply kicked the system into a whole other dimension of palpability, imaging, clarity, and truth of timbre.
I bought the line stage on the spot and I consider it the source of my audio happiness. Also, I like the Mirage OMD series because their radiating pattern is so similar to that of voices and instruments. When the speakers energize a room the same way performers would, you get an improvement in the reality of timbre. Part of what gives an instrument its distinct sound is how it interacts with the room and omni speakers give you that.
I bought the line stage on the spot and I consider it the source of my audio happiness. Also, I like the Mirage OMD series because their radiating pattern is so similar to that of voices and instruments. When the speakers energize a room the same way performers would, you get an improvement in the reality of timbre. Part of what gives an instrument its distinct sound is how it interacts with the room and omni speakers give you that.