Whole-home humidifier?

I've never met anyone who has a whole-home humidifier but I'm looking for some reviews. Can anyone pitch in with their experience?

I've used small single-room humidifiers before, and they're a bit of a pain since you have to let them dry out every now and then, you have to be careful to clean them often and swap filters. I'm afraid of mold starting to grow inside them, so I can't even imagine how much maintenance a whole-home system must need.