Yes, we have one. No, I didn't install it. Better be good at fishing wires and have some sheet metal skills to do the bypass.
Do I like it? I don't think it does that great. I still have dry itchy skin in the winter. But I also run a woodburner as well which sucks the moisture out of the air. I don't know how much of a factor either of them are.
Drain? Yes, it's tapped into the evaporator drain hose. Pretty simple.
Ours has a humidistat. I don't really understand the settings, I just leave it maxed out all the time.
Filter should be changed before every winter. Or at least that's what they told me in school.
Did I cover everything?
Oh, and remember to shut that bypass damper in the summer, that will kill your AC efficiency up to 25%.