Julia W. wrote a review of Patagonia Houdini Jacket - Women's on February 5, 2013
Familiarity: I've used it several times
I actually bought this jacket for a big backpacking trip to replace my fleece and save a little weight based on hiking blog recommendations. However, so far I've used it for running only.
I've had it out in rain and it's been pretty effective without overheating me. I ran for 4 hours in 30 degree weather and was able to pull up the sleeves and unzip as the temp began to climb. It's light enough that I don't mind carrying it on a run if I misjudge the weather and have to strip it off.
My only negative is that the pocket is a bit skimpy for stuffing it easily/quickly. My husband doesn't have this issue with his men's model.
Fit was fine. I'm 5'6", 135 pounds, and bought a large. If I only wanted it for running and didn't think that I'd be layering for hiking, a medium would probably be better.