The serious store owners in my area, who people drive hundreds if miles to get fish from, make a point to tell me when a fish he has came from Rapps. He seems to be the man.
I got my devil from what was advertised as f1 lab but you never know about aquarium born and raised. But being in aquariums over a few generations mellows the fish out I think. Also, socialization is important....if you buy an adult it will be set in its ways. My devil wasn't from Rapps.