Room Treatment: Whatcha Got?

As I learn (Bertrand Russel would say 'as I expand my ignorance') I'm developing a different question to ask of audiophile friends. [ought I say phriends? No!]

Now, instead of asking what gear they listen to, or if they like vinyl, I'm really interested in their room; is it treated, or not? And what technique(s) / how much time is invested in setting up?

That's it: despite the current cover of Stereophile, size no longer matters to me, neither do components at this point. I don't even care about CD / TT until I've learned what effort a listener has put into working the room.

What's your story?