I own several waterproof/breathable rain hats; this on is by far the best! It fits well, the brim stays flat in the wind, it's indeed waterproof, and this hat looks good on me, according to several unbiased observers!
I work on a golf course in the Pacific Northwest which has only one tree, and no natural cover from the rain. I've worn my OR Seattle Sombrero in some heavy downpours, and it has never soaked through. The liner is very comfortable on my bald head, and the chin strap keeps my hat in place even in 20 knot winds.