In a pair they are extremely noisy and messy. These birds are generally quiet, gentle, and mellow. While not as commonly available as some of the other species, their sweet personalities make them well worth a distant drive to a breeder who specializes in them. Of them all, the green cheeks and maroon bellies tend to be the quietest and they make wonderful pets. But, if you have the stamina, don't let the noise rule out a conure.
Amazons tend to be unpredictable, especially during breeding season.
The key here is to learn the body language. The Amazon has excellent talking ability. And this DOES make for an incredibly wonderful companion. But the Grey is not for everyone. The Congo Grey is a nervous, sensitive creature who usually bonds to only one person.