I have the tags prominently displayed on my carryon bags, and I haven't received any extra attention from the TSA, airline staff, or anyone. I think one of the receptionists at an Admirals Club mentioned it once, but that's it.

In fact, the NoS was shut down at least twice as I was in line right before I went through. Is this a coincidence or TSOs not wanting to deal with more likely opt-outs? I'd place money on the former, but it's fun to imagine the possiblities.