I've had them loads of times, they've always been pretty well behaved and they grow quicker than any other fish i've kept including Oscars.
I had an Angelicus until quite recently, i traded him. He was a stunning fish but wouldn't get along with anything else bottom dwelling even in my 6 foot tank. I had a general mix of all sorts in that tank until about a month ago when i took a lot of the fish for trade and now i've kept it all large South American. I have a Lemon Oscar, although he's not very Lemon coloured really, a Chocolate, a Spectabilis, an Electric Blue Acara and what looks like a Blue Acara /EBA hybrid, very pretty anyway. Also an L001, a 4 lined Pim and a Rafael. Once they're all full sized it should fill the tank nicely, its 130G.