I have an exceptionally well behaved

and here is my experience...
You cannot be fearful around these birds. Chica is pretty gentle but if someone who's nervous tries to approach her she picks up on that and takes advantage of the situation by nipping (fortunately, like I said she's an exceptionally gentle bird, but I have met others who are less so)
She does not spend time inside a cage. Yes she HAS a cage, but it's basically just a place for her stuff. She has a large tree and gets the option to free-roam the house. Of course this in itself requires extra care & vigilance to make sure that she is safe (no toxic plants, keep doors shut, put electronics away when done, etc)
They are BIG birds and need lots of space. I've allowed my birds wings to grow back for flight (previous owner clipped them) & after doing so I honestly would never go back to having her clipped. These birds need a LOT of excersise & flying is a great way to get that since they have to work so hard to fight against gravity. Even just a couple laps a day in the house can make up for a HUGE amount of "playtime" to keep her fit and happy.
They can be LOUD. Even the occasional sound off is enough to make you cringe. my

is annoying, but on the rare occastion that my

does decide to sound off you better hope your not standing right next to her. NOT a bird for an apartment by any means.
They are destructive... breaking chunks of wood off furniture is nothing to them. I provide lots of sticks, shreddy objects and have to be extra careful that anything I don't want destroyed is left out in an area where she can easily get to. A frustrated bored macaw can also be destructive to itself with tendencies leading to plucking, screaming, and biting if you do not make an effort to meet those needs.
The eat a LOT, the increase in dietary supplies I have to provide has definitely made a difference on my budget. Even with over a dozen other creatures in my house to provide for, meeting the needs of the macaw has made a noticeable difference.
$$$, yes they are VERY expensive. Even with the amount DIY projects I do as far as toy-making, stimulation & enrichment, you do not get a macaw unless you have a steady income. These birds are far pricier and you cannot skimp on things like diet and housing.
As much as I try to promote getting a rescue, with a bird like a macaw you have to be exceptionally careful. These are big, powerful, active birds. Far too often ones that end up in rescue are NOT suitable for first-time large bird owners. I had set out to get mine with a specific temperament in mind, knowing exactly what I could handle and what to expect from the bird. It was not a decision made on a whim and I had met and played with about 1/2 a dozen birds before making the final decision to go with her.
If you are well prepared for the commitment, time, and dedication it takes to care for one of these beautiful creatures, then they can be INCREDIBLY rewarding... however I would not recommend one of these birds to anyone who isn't already well prepared to take one on.