well, they are not known for cuddling and do not like to be touched sometimes resulting in a little nip. Yes they can speak very well just speak in a clear voice not a baby voice or the bird will be harder to understand when he/she speaks.
African greys are mostly a 1 person bird meaning the bird will bond with only one person.
Yes they can be hard at times to handle but the biggest problem is there emotional problems such as phobias(fear of hand etc) so be careful and try not to reinforce biting in an African grey ether. Now I see you owned other parrots so only you can truly answer this question.
Here is a few tricks for your birds
Always train in 1 room and never train your bird else ware a quiet room works best!
AG like to be in the action so put your bird cage somewhere in the house where they will get alot of interaction.
Never yell at your bird when it screams you are giving him/her attention and will reinforce that behavior.
Potty training is actually easy when your bird is gonna go (shift in weight) go bring her over a garbage can or towel and give her a phrase such as bombs away or potty. This may take awhile and I don't recommend rewarding your bird with a treat when he goes potty because it may make them take longer to poop.
you have a electus which has a specific diet so I don't think food will be a problem
Also when you stoped your birds screaming he will find a alternative such as microwaves because they see you run towards and give the microwave"attention" greys will do this frequently so try to find a quiet way to let your bird know how to get attention.
greys need 2 hours of attention as well and training is a must but beware too much attention can be a bad thing(or is this only cockatoos? Someone can correct me)
also parrots in the wild will spend 50-70% of daylight to forage for food so purchase some forging toys too keep your bird occupied at home while your away, and if your bird does not play with a toy you can take a knife to it >
but only small slits so that his head won't get stuck and put some treats in it to teach the bird to go through all of his toys because they might find some treats!
you have to arrange your parrots toys alot switching out old ones and putting in new ones, every week I think or every 3-4 days.
If your grey feather plucks it could mean that a variety of things like his environment,or boredom or lack of space or something else! Remember great parrot owners are relentless at fixing their parrots problems!!!!!
Oh and show your grey new experiences/shapes everyday trust me they will enjoy that.
well if your having second thoughts that is normal.
Okay I got more but here is my last one because i think you know the rest.
African grey CAN NOT BE in a moist warm room because they don't have the best defenses for yeast infections and other fungal infections. Good luck
ps If i am wrong feel free to correct me i am just going by what I learned because I never owned a bird.