Yes I have kept these. I currently have a nice male. No females in the shop so I'll pick one up when I see one.
They get to about 3". They are quite easy to breed. I have bred the Multicolours on a couple of occasions. From my experience they like good water quality as well.
I have not had any major issues with the agression, but it depends on what you keep them in with. Like most fish species, males will fight.
Hope this helps