many many people have, they are highly regarded as the easiest fish to breed besides maybe guppies.
right now i have 4 convits, 2 of them females for sure, 1 questionably and 1 i'm pretty sure male, and i'm hoping i'll get a pair or two out of this.
once you get a pair, they take care of everything for ya and should breed like clockwork, giving you plenty of free feeders.