Currently only growing one but I have fallen for the fern leaf variety and will be purchasing some this fall.
Very hardy here in central Ohio. I had a mowing client years ago who had two long rows in her backyard and once the bloom was over she'd have me buzz them down at 3". Sounds downright cold-blooded but I never noticed any losses over the years. I've found digging mature specimens to be quite a chore. Heavy clay and planted against a garage, the root system grew both down and out away from the building. I'd recommend starting "wide" if you decide to transplant to avoid accidentally cutting roots.
