it absolutely needs to be noted that Hemerocallis fulva is considered an invasive species and is prohibited from being planted in some states . Be sure to check your local invasive/prohibited list before planting.
THAT being said...I have a very old, fairly large patch of them that came with the property, and I love them. I fight a bit with 'em each year to keep them in the area I want them in (which works just fine, if I'm sure to pull up wanderers at least a couple times a season or when I see them). They provide a huge splash of color when they are in bloom.