I'm pretty sure I've spoken about them here
but agree - they have a low level of following compared to some makes.
I've owned Resolutions from new for the last 5+ years (so they are the original versions) after a lengthy home demo, and have a pair of Torus subs to match. As well as sounding fantastic, the build quality is superb and I've loved every minute of ownership.
Strengths:
The narrow front baffle means they disappear into the soundstage easily
The matching across drivers is superb giving a very coherent sound across the frequencies
Linked to the above, the bass is quick and tight
Music flows from the speakers as opposed to it being driven at you as many cone speakers seem to do
They are relatively easy to drive despite being so-so from an efficiency point of view due to a simple crossover design
Weaknesses:
Bass lacks a punch-in-the-gut sensation without the use of Torus, and even then doesn't match large-cone speakers
They don't quite scale in my relatively large room (11m x 5m) when playing big orchestral works
All in all I've loved owning them and have no regrets in buying them.
With all that said, I've begun to consider upgrading, in a large part to answer the weaknesses noted above.
My starting point was the larger WB's and had a month-long home demo of the Omnium, and initial listening was positive - more dynamic, greater scaling, and a greater weight to the bass. However, after a while this became quite tiring, and in a couple of group listening sessions with people very familiar my system, the consensus was that they were a step backwards from the Resolutions. The delicacy and coherence of the Resolutions was being over-ridden by the more dynamic sound, and no matter how much I played with positioning, I couldn't get them to work in my room.
Interestingly, I heard exactly the same speakers in Munich earlier this year (they had gone straight from my house to the MOC) where they had much more space around them. Whilst they sounded better than in my room, I could still detect some of the issues I had experienced. I also heard the Resolution 3 Zero in Munich and felt that the treble didn't sound as sweet as mine.
I'm still somewhat puzzled as to why the Omniums didn't work in my room but my observations on the 3 zero Resolutions make me wonder if I just don't like the new drivers as much. I've no doubt they are fine speakers in the right system / setting and having got to know a number of people at WB I know they are deeply passionate about what they do.