I am very fond of day lilies and think they are nearly the perfect perennial. They are very tolerant of any kind of soil, they spread into nice clumps, they are never bothered by disease or insects. The only bad thing about them is that they are deer candy, so I spray and spray to keep them away.
Last fall I ordered some new plants and had to wait patiently for them bloom this summer.
I'm still waiting for a couple of the late bloomers, but I love what has come up so far.