I am keeping blue hypnea, red fern, red hex, string of pearls, and cactus halimeda in my soft/SPS tank! You can see pics in my tank thread.
They had a growth explosion when they were first introduced as they stripped my water from 28 to 5 nitrates in two weeks. Since then, they continue to grow but at a slower rate.
They’re all gorgeous and I love them. Because I am still in the ugly phase, I do have some issues with macroalgae and detritus buildup on them but I think my CUC is doing a decent job—they climb right onto the macro like they do anything else. I think I’d be experiencing worse ugly phase issues if the macros weren’t in there too.
tl;dr is that I think display macros are awesome and I don’t get why more people don’t do them!!