Love it, but I'm too lazy to go back down the stairs to add it.
Unless it's changed, my mom used to have us add it during the rinse cycle - in fact she'd have us turn the dial back to do a second rinse cycle. I hated doing that, so when I moved out on my own, I never ran back down to add it during the rinse cycle.
Is that how it's still done? I have no idea! I never use it!