I have Zella Virginia & look forward to it's blooms every year. Not the most prolific bloomer in my garden. But very reliably double. I don't think I've ever seen a single flower on it. The form is also hose-in-hose which is my favorite double form.
As a later bloomer I love the creamy pastel peach color it has while blooming in the hottest part of the summer.
I purchased this last summer and just love it. It was a long and prolific bloomer during 2017 which was a pleasant surprise considering that was its first year in my garden. It's beautiful any time of day.