Best rain jacket ever!
Lightweight and flexible while still being sturdy and waterproof. I wore this all of last winter in San Francisco (lots of misty days and plenty of rain) as well as ski tours in the backcountry when the weather was bad and was always dry underneath it. The large pit zips are GREAT for aerobic activities, they dump heat well and the jacket actually seems to breathe (even with the zips closed).
I've also worn this jacket as a windbreaker while climbing granite in Yosemite and it held up AMAZINGLY. No damage!
I cannot imagine a better product. Its great alone or as a layer when the weather is colder.