I thought I'd adore AC's but it wasn't the case. They're visually striking and many people thought they were intimidating. Even though I handled them a lot as chicks and young birds, they were always a little on the skittish side. I raised them for almost 4 years and had 16 or 17 at one point. In my experience, they aren't prolific layers, the eggs are smallish and, unless you're mercenary in culling, you'll end up with a lot of birds that don't conform to what is generally accepted as an "Ayam Cemani". Pink toes, mulberry combs and wattles, patches of non-black feathers, patches of red in the comb/wattles, feathered legs, etc. From my investigations, a lot of backyard chick mills apparently incorporate black silkies in their breeding programs to add back in the fibeomelanistic genes that are lacking in their AC breeding stock. That means that your AC's progeny may show walnut combs, five toes or silkie type feathering.
I sold mine to people who, like me, thought they'd adore Ayam Cemanis.
I currently have an adult flock of a little over 30; mostly Ameraucanas with 8 or 9 RIRs and a handful of other breeds. The RIRs are friendly and inquisitive and lay daily, even in our current central Texas heat wave.
Right now my passion is finding a light or white chicken that is a prolific egger, gets fat enough to use as a meat bird and is heat tolerant.