I agree with Fred. It is more economical to have fifty Stella's (or her look alike) than fifty "Jewel Of Jewels" unless you "got it like that".
Of course the little ones also bloom for a long time and that's what make them so popular. I have a lot of the long bloomers in my front border. The only yellow ones are "Yellow Lollipop, Going Bananas and "Black Eyed Stella".
I don't have any of Nichole's yet, but, I am coveting a few.