Where exactly is this ego? A drive for great products does not a a great ego make.
You can go look up what the early MacIntosh developers say about Jobs trying to grab credit for things he originally tried to kill and/or mismanage into the ground.
And have you ever heard him give the names of the engineers who actually did iOS and its UI? No, nobody has. He likes to cultivate the fanboy idea that he creates this stuff himself, even though he's never programmed or designed a board in his life.
However, aside from that, his temper is well known.
My favorite Jobs story was told by someone who was visiting the Apple Campus as a sales rep. As you might know, Apple employees avoid getting on an elevator with Jobs just in case he's in a bad mood.
So he ended up alone with Jobs, thinking "well this is cool!", when Jobs suddenly turned to him and snapped, "So what have YOU done for me today?"
The sales rep was taken aback for a second, then stuttered, "Uh, I used an iPod this morning on the way to work."
Jobs whipped around on him and yelled, "That's it? You're fired! I want you off this campus by the end of the day, you hear me? What department are you in, and who's your boss?"
The rep managed to explain quickly that he didn't work for Apple, but was there to sell something. "Oh," said Jobs, and stepped off the elevator at the next stop. The rep left too, thinking "Holy smokes!"