To quote one of my books, "A mildly agressive species that should be maintained in groups of eight to twelve. The aquarium should be at least 75 gallons (300 L) and there should be plenty of rocks piled up to form caves and passageways. Can be kept with smaller, less agressive mbuna."
Sounds like there is meaner out there, be a good community mbuna IMO.
Everyone's experience will differ but mine were a bunch of jerks. I kept 5 of them, and chances are I had 4 males and 1 female, which didn't help. They were constantly lip-locking and chasing other fish around. They're a zebra, which means they act like most other zebras. Not quite as bad as Auratus or Chipokae, but still pretty jerk-like.
If you are going to keep them, keep them in a good sized tank and watch your M-F ratio. Beautiful fish though.
I have 1m/3 f in a 5 foot x 20 inch. The male is very very aggressive, he harasses the 3 females constantly, and also gets in the mood to chase every other fish in the tank, even males that don't resemble him (yellow lab/hongi/acei ngara/demasoni). If there were only two females I'm sure they'd both be dead by now, but for all that he hasn't killed anyone and his shade of blue is just stunning, theres not a blue like it anywhere else in nature.