I have had no complaints. No one questions them. A handful of cashiers will look at it, scrunch their face and usually put them in the cash drawer. One however, did pull out a marker to check the validity of the currency, i.e. 50FRN or 100FRN (this was a 20FRN). It was real, so she put in her drawer. Even the courts have taken them without question.
EDITED TO ADD: I am not worried about defacing/destruction of the FRN. I am doing neither. A FRN has value as long as there is 50% or greater of the note (it's not a note) remaining. Destruction is not occurring. Defacing? Nope, as the FRN has been redeemed, I am acting in "good faith," letting those who can comprehend its meaning to have the ability to make a choice regarding acceptance of public money. Good faith is what the law requires. If there is a problem, then the law can show me the proper way.
To date, no one has refused them. If they did, I would need them to state in writing that my FRNs were refused, signed and dated, and if possible company policy guideline and/or code. With that, I can make a legal determination of my own regarding my next course of action.
Delawarejones