Full almost always. Then again, I almost always have it plugged in. When I know I'll be away from power for a while, I'll drop it down to the minimum or one above that.
I change mine a lot throughout the day. Definitely depends on the lighting. It's usually at about 90% unless I am sleepy. Then it gets turned down a lot
Man everyone on here keeps that thing high. I prefer to keep it a little darker about 1/3 from the lowest setting. Yet then again I like having the extra battery time!!!
I let the auto brightness set it self for whatever room I'm in and if I don't like it I change it and/or if i like where it's at I turn it off until the next location change.