This is a pattern that I bought immediately upon seeing Through the Loop's post. It is an awesome hat. However this pattern has tested me. Like the A.D.D. Knitter said, you've got to put away the iPhone, shut off Twitter and concentrate on the herringbone portion. And if you're me, every other part of the hat, too. It's worth it, though, for this fabulous design.
As you can see from the above photo, I almost finished this hat. Then I discovered that it was too small for my head. A sad moment that I am trying to quickly put behind me by re-knitting on larger needles (7 and 8 instead of 6 and 7).
But if you take a look at the Ravelry page for this pattern, you'll see it's worth starting over!