I purchased a Columbia Omni-Tech Waterproof breathable rain jacket for my thru hike. While I was in a couple of torrential downpours, the water seeped completely through the jacket so much that the jacket's sleeves were sticking to my arms! This was not my sweat but the rain soaking through the jacket. I would have been in a lot of trouble had I been hiking in freezing conditions, such as the ice storm we experienced in the Smokeys in March. I am sending the jacket back to the President of Columbia Gear regarding this.
With that said, I'd like to hear your recommendations for a rain jacket that is really waterproof on the outside so I can order it when I flip to Maine. Right now I am using a Coleman's vinyl poncho. Thanks everyone.