I am not a big fan of the doubles form, it just looks so "untidy" or "disorganized", still there are a few that are growing on me.
This first one I could not stand when it first bloomed and it is registered as a single, but as the season progressed and the plant churned out the blooms and then it rebloomed I guess my appreciation of the plant itself won me over finally accepting the bloom form. There has never been a bloom on it that looked like a single.
'Royal Eventide':
A double that I seemed to like form the beginning (I think it is the color combination) was 'Scatterbrain':
Buddy's Gloria: