I asked Leupold's customer service about the subtension on the Duplex reticule. This is their response:
"They are nearly identical.
The thin section in the illuminated model is:
2.4 on 2X and .366 on 12X
The thin section in the non illuminated model is:
2.2 in. on 2X and .4 in on 12X."
I am ordering the illuminated model.