@bluegrassmom, I do not know why they are not more popular. They do not get as big as the others and they are blooming machines! I first saw them on GreatGardenPlants.com and they were probably 25.00 each, but I got mine from a seller on eBay, she sold me 10 small plants for 25.00! (They grew fast.)
@ge1836, I love Caroline and Kiri te Kamawa!
This is a picture of 'Diana's Delight' the flowers are about 7 inches wide.