I got Back Scratcher in 2013 in an online auction and it has done well for me, although some of the blooms have been splotchy. It has sturdy scapes that stand well above the foliage. No rust here.
I don't have a good picture showing bud count and branching, but it has not reached the 6-way, 36-40 buds given in the database specs.
June 23, 2020, around 5pm - The color does fade throughout the day. It blooms for about a month-early June to early July.
I had 'Applique' sitting right behind 'Back Scratcher' and had to move it last year. They look very similar in this picture, but Applique is a little taller and the eyezone is different.
The color is described as purple, but a lot of my pictures make it look more like a reddish-purple. But on overcast days, the purple really comes out.