I've been an admirer of the .380 ACP for the last 40 years, starting with the Walther PPK back in Germany in the 1960s. However, when the Rohrbaugh became available in 9mm, I suddenly "got religion." I shall always have my G380 somewhere nearby, but I expect from now on to be carrying my R9s on a regular basis. Besides, just consider the wide range of ammunition available in 9mm -- all the way from the ultra-light supersonics to the heavy-hitting subsonics. (As for myself, I lean toward the latter for a defensive round.)
RS