I've fostered a pair of MRAs. They are among the most active amazons out there. They are fairly outgoing. They do tend to be on the loud side. Not M2 or Macaw loud, but about one notch below that... So yeah, pretty loud. They also tend to be one of the milder mannered zons. (lilac crowns being the mellowest, then mealey's, red loreds, yellow crowns, and these guys.)
They do not tend to be screamers or pluckers. They can be territorial, and they can be territorial and hormonal biters... doesn't mean they will be, just that it can happen, especially if they become cage bound. Getting them out away from the cage generally lessens these behaviors, or makes them go away.
Amazons are clownish. They can be sweet. They can be moody. They can be anywhere from very active to perch potatoes. It all depends on how they were raised and interacted with. They are very hardy, and very independent. They self entertain quite well.
They can be jealous and stubborn. They can be excitable, and are prone to amazon overload if you get them worked into a state. Step back and let them calm down before picking them up.
They tend to be seed junkies and are prone to obesity, and fatty liver disease, so diet is important. Seed should be no more than 10% of their diet. (I just sprinkle a little safflower seed over the top. And it always goes first.) They also tend to suffer from vitamin A deficiencies, so vitamin A fresh foods are essential. (Most will eat sweet potatoes and if you feed them this a few times a week it never becomes an issue in the first place! You can bake one large sweet potato, cube it, and freeze it, zap it in the microwave for 20 seconds, and with only one zon in the house that's easily two weeks worth of "fresh" food. Easy, easy, easy!)
These are pair bond birds. In the wild they pair up and become inseparable. They tend to form those same bonds with "their person." With all pair bond birds, overbonding can cause issues. So socialize them properly... or the only person that can handle the bird ends up being the favorite person...
Amazon body language is very complex, and that is a key to training them. You need to understand that when getting them. Eye pinning, tail flairing, posturing, etc. all mean something with these guys. People get bit because they don't understand what the bird is telling them, (or choose to ignore it then have the nerve to look surprised!)
They are VERY easy birds to read, and very predictable IF you understand and speak their language.
My favorite birds are Macaws, amazons, and conures... (the pair bond birds.)