I got this jacket about 3 weeks ago and haven't had time to test it on any real hard hikes or runs, so I can't give it five stars yet, but it is very comfortable, surprisingly warm, weighs 3.2 oz (med) and has blocked a lot of wind and some light rain on my 15 minute bike commute.
I am 5'6" and 130 lbs and usually I wear small jackets, therefore I originally ordered this jacket in small and could barely get my arms inside, it was so tight in the shoulders. I now have the medium and it fits snuggly over a capilene shirt. It was very tight when I tried it on over a 200 wt fleece. I am happy with the fit since I was really looking for a windshell for windy spring days and summer mornings.
I recommend this jacket, especially if you are interested in low weight and some waterproofing, but go up at least one size (two if you are looking for an outerlayer).