My experience with SC2's is they are very sweet, but they can also be among the worst tantrum throwers. This is a relative concept, because with toos it's all about how you raise them...
The thing about most Toos is people tend to want the big ones (M2's U2's), or the really small ones (G2's). That's where the demand is, so that's what the breeders tend to focus on. (Personally, most folks cannot meet the needs of most M2's which is why so many of these birds end up plucked down to their very last head feather. I love them, but I am sorry they were ever introduced to the pet trade. I've seen too many horror story M2's.)
The only toos I ever brought home were a Rose Breasted, and a pathetic looking plucked bald little Goffin's who jumped into my arms, and refused to leave.
I was the first person who had ever succeeded in handling that bird, and they quite literally begged me to take him on as a foster. So we did. I ended up being the "meanie" who put the medicine on his open sores, so he ended up being my daughter's bird. (She would run to her as soon as I finished putting the medicine on her, and tell Sarah all about it....)
We got the bird to stop plucking, but it came at a terrible, terrible cost.
This bird still OCD'ed on preening, just did it with preening toys and preening rope. She ended up ingesting so much of it, she died of an intestinal blockage...
That one was a neurotic tortured soul of a bird.
Obviously, I am the last person to ask advice from about plucking disorders. I thought I was helping at the time...
I've rehabbed a few toos, but those were the only two I ever really lived with. RB2's are friggin' WONDERFUL birds!