REVIEW 3 OF 3: LONG-TERM REVIEW ON AUGUST 9, 2012: 5 STARS

You don't know what you have until you lose it.  Although that's a cliche, not being able to find this hat when I needed it made me realize how valuable it's been to me these past five months.  Great fit.  Airy ventilation.  Stays on in windy conditions.  Rugged.  It's not the most fashionably upscale hat.  It's become more like a comfortable, good-fitting pair of broken-in jeans. And it was a relief when I finally found it.
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REVIEW 2 OF 3: UPDATE REVIEW ON JULY 18, 2012: 4 STARS

I'm giving this hat a promotion from my initial 3-star review because of two useful traits: the outstanding fit has consistently kept the hat comfortably on my head in windy conditions, and its durability retains its shape well.
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REVIEW 1 OF 3: INITIAL REVIEW ON MARCH 5, 2012: 3 STARS

My head size: 7 1/4 (22 3/4 inches)

Size bought & color: Large & Mushroom

Fit: Outstanding. I don't have to micro-adjust.

Outdoor Research's claimed brim size: 2 3/4 inches

Actual brim size:
 - Front and back are 2 3/8 inches.  That's 3/8 or 0.38 inch shorter, which is a 13% reduction from what's claimed.
 - Sides are 2 1/2 inches.  That's 2/8 or 0.25 inch shorter, which is a 9% reduction from what's claimed.

Best features:
 - Comfortable fit
 - Lightweight
 - Airy ventilation due to the mesh
 - Classy embroidery
 - Very good materials

Least desirable features:
 - Bad quality control for the brim width because the consumer is short-changed 13% on the front and back, and 9% on the sides.
 - No pocket for the chin strap. Instead, I have to remove it. That makes it easy to lose the strap, or renders it useless if I'm elsewhere with the hat.
 - The crown is too low, as it sits on my head. This makes the hat feel small even though it has the right fit.
 - The brim's actual narrow size doesn't block the sun during the dawn hours before 7:00 a.m. when the sun is rising from the horizon.

Would I buy it again?
 - Because of the undesirable features, this hat could still be improved.  Most importantly for me, however, I wouldn't buy this hat again because I don't have visual comfort during dawn.  In fact, I eventually bought a Tilley hat with a wider brim size (and a higher crown with a pocket).  Nevertheless, this Outdoor Research hat is an adequate purchase that I still use.