Aria managed to talk, bribe, or blackmail some pretty big names in bluegrass circles into using their Pro II instruments in the late '70s and early '80s. I believe Mac Wiseman played one for a while.

I remember trying out a Pro II dreadnought during a spell of being disgusted with the D-35 I had at the time. It was impressive enough that I almost sold the Martin and bought it, but better sense ultimately prevailed.