Re: Speaker breakup and articulation...
Gr8Scott-
I just put one Cali in my Pro Reverb (the other speaker is a Jensen that I will probably replace with another Cali soon). It's the paper dome ceramic one, and it's nice. The amp tech I know was pleasantly surprised because it has some of the power and stoutness of a JBL type speaker, but it doesn't go over the top into aluminum dome territory. It's closer to one of the F150 types than he thought it would be i.e. it's not something that might sound foreign to someone hearing it for the first time. Granted, I play clean 80% of the time, but it sounds nice with a pedal as well.
FWIW, I think Weber pushes people looking for a JBL type speaker towards the paper dome ceramic...at least that's what they did for me.
YMMV, etc., etc.