IRV promotes positive campaigns. IRV boosts voter turnout. Experience has shown that turnout increases when voters have more choices. IRV makes votes count. IRV increases the likelihood that one's vote will be decisive.
Many counties already have IRV-compatible equipment.
Paper IRV ballots are commonly used overseas. Where IRV has been adopted, it has endured for decades, so voters are comfortable with it. IRV is one of the simplest voting methods in use. No, because it still relies on single-winner majority votes. IRV simply measures voters' will more accurately.