I have kept them, as well as another - Centromochlus romani. The C.perugiae are very active at feeding time, even with the lights on, especially if feeding bloodworm or other frozen foods. Easy to sex, using the anal fin as a guide - their anal fins look similar to the livebearers, i.e. a 'stick' for a male, and a normal fin for the female. Best kept in small groups, more females to males, I kept 2 males to 5 females, so would say aim to keep one male for every 2-3 females. A cool water change can trigger a spawn, and the eggs are often fertilised internally, meaing that the spawn will produce a batch of eggs with wrigglers already present inside. It's fascinating to watch. The c.romani just scatter their eggs and seem to have no parental care at all.
HTH
Martin