I have the aviator harness. I'm pretty satisfied with it. It's very easy to put on.
Check out the articles and videos about training to put on the harness.As for the predator threat. First off it is real and present. I watched a Coopers Hawk snatch a pigeon and eat it right in the middle of a playground in Brooklyn. At that point it didn't matter what I did with Kili because the hawk was fed but I grabbed and held her in my hand for a while just in case. Several things to do include being on the lookout for hawks. Look both high in the sky where they may be thermalling and also look at trees if possible. Look around and see if other birds are flying peacefully or fleeing. The parrot will be looking out as well so if it looks stunned or scared, do not force it to fly, look around, and be more cautious as well. The last thing I'll say about the bird of prey threat, I have made a decision to take my bird outside well aware of the danger, I don't recommend it for everyone and suggest each person consider it individually. But I have decided that if I lose my bird, I'd sooner lose it to the threat of predation than stolen, sick, or lost. The predation one is the biggest variable and most out of our control but yet it is also the most natural. So I do my best to protect her from all others as well as predation but that is the one chance that I am knowingly taking.
This is another reason I only harness fly her but not freeflight outdoors. By keeping her on a harness, she's generally closer to me and I try to keep her less open. If I have any chance to grab her at the site of a hawk, that is what I'll do. If she's out and about freeflying, there is absolutely no way she could outfly a hawk. She is missing feathers and is not a very good flier. So I feel that in her present condition, she is safer harnessed rather than freeflying outdoors. The recall training seems pretty uninhibited by the harness and I hardly ever have to pull on the harness to get her back rather than no pressure recall.
In this
video I show a typical outing with Kili (it's a bit old, we do somewhat more advanced stuff now and longer distance) and in the middle of it you can see a shot of the Cooper's Hawk with its catch.