I have had mine for about 26/27 years now. Got him when he only had pin feathers and couldn't even perch. Had to hand feed him w/a syringe which is probably why he bonded to me so closely.
I love him to death and he is hilarious, when you are having a bad day they can cheer you up. He can bark in over 100 different languages (thanks to all the foster dogs over the years...)!
Mine has also proven that they can and will put sentences together. When we moved in with my sister for a few years, we were introducing him to all the other animals, this is Sweetpea she's a cat, Rhett this is Rock, Rock's a fish.... A couple of days later this bird was now a bad bad bird fish... We were in the kitchen one night and we hear Rhett - Hey Rock - You're a fish!
We had NEVER said that and the only thing we can think of is maybe we had a talking fish too!
Grays are very resilient birds, I have moved multiple times, across town and across country, he has always adjusted within a day or two. He has landed between 2 Rottweilers on the floor, another time one Rottweiler had his head in his mouth going for a grape (that one scared me).
I have been told that I have a "loud" Gray, he amplifies everything times 10... the microwave, the truck backing up, the zipper on my bag, my snotty nose during a bad cold.... (took me awhile to figure out what those last 2 noises were).
Even if you can never handle him, once he becomes comfortable in your home and around you all you will enjoy him immensely.
By the way, mine HATES the shower and the squirt bottle, but he loves to bath in his water dish or a big water bowl when I put it on the grate.