I have Prairie blue eyes. I just don't like it. It will probably go eventually once space runs out entirely. I know some folks love it but it just washes out so badly for me. By the time I come home from work it just looks bad, at least to me. It is extremely vigourous though.
I also have Mormon. I love the bright color but it always blooms down in the foliage. The form is variable from one day to the next, but I kinda like that, I just wish the scapes were taller. It will probably go eventually too.
Johnny Cash has been here 3 years with no bloom or increase. I moved it this fall to a prime location where every plant I've ever had there has performed. It did start to increase from one fan and now has a baby fan too. If it doesn't give me at least one more fan and/or a bloom next year it will have to go. The only reason it's stayed here this long is I spent too much on it not to see it!
Kim