PW - I am all ears for as much detail as you care to share regarding your auditioning. The Crossover Upgrade Project is addressing all aspects of crossover performance. Jim's CS2.4 Signature Edition significantly upgraded tweeter feed capacitors, which certainly affect the entire midrange clarity. Our work will replace those ClarityCap SAs (then state of their art) with CSAs which are considered significantly better. Additionally we will be CSAing the upper end of the woofer, which certainly addresses the lower mid-band (I can also afford to lighten mine).
Update: I now have in-house all the ClarityCap CSAs and CMRs along with RTX and Cornell Dubilier styrene bypasses and 4-9s wire and foil coils to build out the PowerPoint, CS2 2 and CS2.4 prototype crossovers. My test mules are my PowerPoints and CS2 2s before we take on beetlemania's CS2.4s. I have two levels of upgrade specified for each of those first two products.
I am listening closely to the collective listening experience of the various forums, to augment reviewers and my personal experience. All are welcome to chime in regarding their perceptions, especially of two-series products. My available time is a distinct limitation, but my interest in the Upgrade Project continues to grow.