Although I would grow it just for the leaves and texture, we get the added bonus of dark magenta flowers in spring. They last for a few weeks and really make a dark corner pop. They don’t always bloom at the same time for us, so be careful siting around other pink plants. It clashes terribly with a bleeding heart, for example.
In our yard it colonizes nicely in some shady nooks out back, but it usually doesn’t crowd out other plants unless they’re very short. I don’t know when I first planted it, but it’s another plant that I can’t imagine being without.