I sure don't know much. We have 2 golden sebright chicks. They will be 4 weeks old in a few days. Our local feed store had them, I saw their mature picture, and decided to get them because I also thought they were pretty.
After the fact I read on another site somewhere they are not a beginner's bird. It didn't say why.
At the same time we got these two chicks, we also got two barred rock chicks. Barred rocks are known as very friendly birds. There is definitely a difference between the BR's and the sebrights. The sebrights are maturing much more quickly. Their feathers came in fast and they were interested in being out and about and exploring. One of them is also a bit aggressive. We've been referring to her as a brat.
We have another group of chicks that will be two weeks old in a few days. We recently introduced the two groups - since they will be living together - we weren't sure if this was a good idea or not, being newbies, but it worked OK. Except for the one brat sebright - she will peck at some of the younger babies - they run now when they see her coming.
Among the ten chicks we have, if I had to choose two to give away, it would be the sebrights. I just haven't bonded with them the way I have the others. That's my opinion today. Come tomorrow it might be totally different...