I ordered the upgrade and receuved the new nano drivers, still waiting for the radians. These drivers are really nice, detailed, clean and dynamic. With the old tweeter there seems to be a gap, it is more present now not as blended, I have a 10 ohm resistor and feel the Druid original 12 ohm would work a little better.
I did the cabinet damping a few years ago along with a Griewe wedge so my results maybe atypical. Sean assured me the new tweeter and hi pass network will blend effortlessly.