Generally pretty docile but they can be world champion bluffers. hissing, and closed mouth strikes (they'll bump you with their nose) and sometimes flattening out their heads like a wannabe cobra. I didn't see much of that with mine though. The ones I used to have did have a killer feeding response though and I almost got tagged a couple of times while feeding. I could take the female out of her tub, set her on the floor and hold a mouse in a pair of tongs and get her to chase it all over the room. She'd slither really fast with her mouth gaping wide open and her head way up high trying to grab that mouse as I would hold it just out of her reach. She would keep it up for a long time and I could get her to run an obstacle course holding that mouse up like a carrot on a stick.
She was generally real good with handling too but when she'd had enough, she would go real limp and rubbery. The first few times this happened I got real worried thinking that she may have gotten overheated or something. But when I put her back in her cage she'd act all normal again. After a while I figured that she was doing the famous hognose 'playing dead' trick but only halfheartedly.
They're real interesting animals with different personalities then 'normal' snakes.
Mark