I love convicts, but mainly females with bright colours. I have a picture in my profile of one I have. Females don't grow very big either. Around 10cm average, give or take.
Its true that they breed like crazy, and most aquariums wont be enthusiastic to take them off you.
They are quite aggressive. Even the females. Which is different to what the internet has told me. So don't believe everything you see online.
Mine tried to kill every bristlenose catfish in tank. And they chase other fish around a lot, and show strong dominance to mark territory.
They have better luck with other aggressive American cichlids like Salvini, Texas, etc etc As long as the tank is big enough....
I'll post pic of my female here. She's 5cm big.