The "Hero-shithead roller coaster"

Apparently there won't be Flash on the iPhone anytime soon but John Paczkowski comes up with this zinger about what it's like working with Mr Jobs:

Subordinates are geniuses or ‘bozos,’ indispensable or no longer relevant. People in his orbit regularly flip, at a second’s notice, from one category to another, in what early Apple colleagues came to call his ‘hero-shithead roller coaster.’”