I've owned both the Essence and the Druid MkIV/08. From a certain point of view, the Essence is a better all around speaker. Less finicky placement, better low end grunt and better high frequency extension. My expectation was that it would be a Druid Plus, but the dynamic quality, aliveness and coherence of the Druid does not quite carry over unencumbered to the Essence.
Maybe that has something to do with the Atma-Sphere S30 I was using. You would think 30 stereo watts into 97db sensitivity at 12 ohms would be enough, but then again, some people do say that even the Druid doesn't truly come alive until you get to 40 wpc territory.
The Essence is a very good speaker to be sure, but I missed a certain kind of magic that I heard in the Druid, and so the Essence is now sold and I'm on the waiting list for the Soul Superfly. I'm sure the new owner will be very happy with his Essence, as it is a very good speaker with no obvious deficiencies to these ears. The Essence is also very pretty; the jet black gloss finish is beautiful.
One of the things that I didn't understand well before was the concept of audio priorities. I'm now able to answer the priorities question, which is to say, my priorities lean toward the aliveness and dynamic quality of the Druid, and now also hopefully the Soul.