Well, the downside to Hyacinth ownership isn't the bird's behavior, it is the unforseen expenses:
1. The high cost of macademia nuts and palm nuts... which are staples of their diets.
2. The high cost of stainless steel cages. Keep in mind that these guys can pop cage welds on "normal" wraught iron macaw cages.
3. With big strong beaks comes large toys, which get turned into toothpicks at an amazing rate.
4. BITE PRESSURE!!! Yeah, bite pressure training these guys (though easy to do) IS NOT optional!!!
5. These are the most toddler like, of the most toddler like parrots out there. THEY ARE UBER-ATTENTION ORIENTED. Don't even try to ignore one. They won't let you...
6. LOUDEST... They don't tend to be screamers AT ALL... but when they do go off, which is usually once or twice a day, well... they are the loudest thing in the room. Even if that room is an airplane hanger... with a jet plane in it... and the plane is revving the engines... 'nuff said.
7. Don't Piss him off! (See Bite Pressure, above!) [Okay, that last one was a joke. But it is worth mentioning...]
Other than that, these are big old mushy lap birds, that tend to love everyone... smart as they come. Easily trained. Amazing to work with...