I got Susan Weber in 2008 and it has not increased very fast at all. At last count in 2022, it was around 20 fans and it has not been divided. What I love besides the beautiful blooms is that it begins blooming in late June and continues to bloom through almost all of July. I've not had an issue with rust.
I don't have a lot of clump pictures to go on, but I don't remember it having great branching or bud count. This is one of the few clump pictures I've taken in all the years I've had it that kind of shows branching and bud count.
While it doesn't have a lot of great stats, the beautiful, fairly late blooms are great to see when others daylilies are done.
This little guys loves the blooms too.