How about the Opal legbar's personality? Are they more flighty? It looks like they may have isabel leghorn bleed. Can you tell their gender easily? They are very beautiful with or without a crest. I even don't mind if they lay brown eggs.I'm not really a fan of the cemani's either. I think they were hyped beyond their truth. For an all black bird I am happy with Black Ameraucanas (blue eggs) or Black Sumatras (fabulous tails). Some people really like them, so I am happy that I can hatch some.
The Opals never seem to be as well crested as the Rees Legbars. I plan to work on that by crossing them to my line of Rees until I get good crests and all blue eggs. I haven't take pics of mine yet, but they are pretty common online.