This really is a very underused plant. Very healthy and no pest problems whatsoever here.
The blooms aren't big, they certainly aren't long lasting, but they are fantastic when viewed close. Lovely foliage as well.
I only have a single plant of what I believe is Epimedium × rubrum. I had it for many years and it does grow very slowly, but that also means it's very low maintenance and that is a really good thing. It has surprised me with its drought tolerance - I really didn't expect it to be as though as it is. That said, when I finally get around to replanting and dividing mine I'll try to spoil it a bit to see if I can get it to grow at a bit faster rate.