Rosami and Jon and all - Yes, there are various new crossovers and yes, what is being learned on the 2.4, 2.2, 1.6 and PowerPoint all applies directly to the 3.6. And I have a pair of 3.6s on hand.
My present work includes developing my measurement and listening systems to apply the required rigor to the upgrades.
Regarding your questions of purchase, I can make no comment until the Thiel Audio bankruptcy settles.