I've read absolutely everything I can find on the species, I know how big it can get, and I have a suitable and currently uninhabited tank in which it can live. When it outgrows that one, I'm willing to make a pond for it. Basically, I know what I'd be getting into, and I think that it's okay.
Am I totally and completely insane for wanting a potentially gigantic tankbuster of a fish with big spines down its sides?

Anyone here have one? Is there anything I should look out for, in particular, if/when I bring it home? Are they prone to any particular parasites, bacterial infections, or the like? How fast DO they grow?