Thanks for you response, Constantin.
Yes, I do have a Nomad 12 with zaxnet. And that is what makes this option attractive when considering the relative price difference to the PDR. However, I just sent my nomad back to the shop for the third time to fix the zaxnet transmitter on this unit, so I am not super excited to loose that functionality with the ZFR400 if this happens again.
I have 4 Zaxcom recording transmitters, but I use them mostly on talent, and with a plant mic you would be using a lav or other mic that is wired for that connection. Whereas, for example, an Omnigoose would plug directly into the lectro PDR.