I bought Bill Fall in fall of 2021 on the recommendation of Brian Reeder because of its rust resistance.
The plant has done well since then. According to my records, it bloomed in mid-May and into June. For some reason, I don't have many pictures, but I agree with mantis above--it is a bright, brilliant red, very similar in its look to Passion for Red, which I have planted in the same bed. It did not have a huge number of blooms, but I will look for better things as the plant matures.
It did get a little rust long after its bloom was over, but it remained clean throughout the growing season, so I would describe it as rust-resistant.