I finally ordered and installed /setup a 10" gimbal FB for my Prime Signature from the JMW 10" 3D Unipivot. I did a quick and easy setup so still have to fine-tune but is about 99% there (I know that 1% can be huge).
Inital thoughts are as follows from in headphones only so far (Focal Stellia),
Even in closed back HPs, the amount of space around the instruments and imaging is mind blowing. Low end is more full. I read a comment once that it sounded like "more meat on the bones" and I agree with that.
One area that I'm still coming to grips with and may improve once I dial in that last 1% and the tonearm wire burns in is: I listen mostly to classic rock and like my lead electric guitar to sound "searing" - will cut right into you. The gimbal FB has a little less grit / edginess. I also heard this in the keyboards in another (Crazy Diamond) and horns in Savory Truffle. I'm hoping this improves but am thinking this is from going from unipivot to gimbal.
I'll update again once I have more time with it and dial it in further.