RAD,
I will definitely stock a few pacu just to see how they do in my relitavely short season in Louisiana.
I would absolutely love for my brother-in-law to hook one and get a picture of his facial expression when he sees those teeth.
I fished a few ponds in S. Texas and caught my first "Rio Grande perch". Man, that fish had teeth like a pirhana, and in fact looked more like a pirhana than a sunfish.