So, I met with local luthier extraordinaire Gene Baker of B3 Guitars (and Roscoe Guitars and Basses as well) and he was kind enough to give the new Celestion driver a test drive for me.
He used 2 guitars.. a Zakk Wylde Les Paul in drop B tuning and one of his guitars in standard tuning.
The F12-X200 did not disappoint. To me, Celestion has hit the mark in delivering a speaker that has the ability to deliver the articulation and feel that guitarists desire. The bottom end was tight in drop B without being flubby. The high end is nice and smooth.
EDITED TO ADD: It is worth noting that Gene did not edit his patches at all... we only had maybe 30 minutes or so to give it a go with a couple different guitars.
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There is some video up on Gene's Facebook page and I'll be posting some on mine as well as my Instagram and Youtube pages... as soon as I can figure out how... or get my 10 year old to do it for me!